HELP! w/ Amphipods & Dragonettes

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JonnyTorch

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Please help! I'm scratching my head and worrying about these little guys. Really needing some solid advice here...
I've been able to keep a Scooter Blenny and a Mandarin in my 20g dosing Pods every month or so, without any issue. AIO tank with middle column as a lit refugium. Well over the last month I've noticed TONS of amphipods growing in large numbers, in the fuge and in the main tank. My Dragonets don't touch them. I have added a Six Line to help eat them.., but the six line will also eat tons of copepods too.. but it's only temporary I'm sad because I do KNOW that the Six Line will eventually decimate the amphipods & copepods and starve the others. My Scooter Blenny eats frozen no problem, but my mandarin is a little guy, captive bred BIOTA. They don't fight.

I've been thinking about lowering the water and flooding the overflow and fuge with freshwater to kill the amphipods.. they are growing and the large ones the Dragonetts want nothing to do with them (up to 1/4 to 1/2 an inch). They live for like a year so I'm worried they will gain traction. The Six line eats them no problem but with a small tank, I'm beginning to worry. The Mandarin needs to eat Pods and so does the Scooter, but when I keep adding copepods, the amphipods seem to eat the copepods too.. when I look in my fuge its TONS of amphipods. What can I do? Will flooding the fuge with freshwater for a while help out a lot?

This is giving me a headache. Not looking to tear down the tank. I'm afraid my refugium in the back of my All in One is small. About my arm's width/length. I'm worried about the copepods being decimated by the Wrasse, and the mandarin starving out. It's a small tank. The idea was to throw in the Six Line to help combat the amphipods infestation, but he's got a fat gut now and I'm worried the pods wont be enough for the mandarin. I can keep adding pods all day, but the issue being that Amphipods will eat copepods and reproduce, the amphipods will eat the offspring/eggs of copepods, and the six line will eat both the copepods and amphipods leaving the mandarin and scooter blenny to die.

Any ideas? What would you do? Thanks
 
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MaxTremors

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The mandarin is the only real issue. If the scooter/oscillated dragonet (they aren’t blennies, not even the same order) is eating frozen food, it’ll be fine (obviously having copepods to eat is the better option, but it won’t starve or be malnourished eating frozen). In terms of boosting your copepod population and mitigating the predation of copepods by amphipods, I would put some marine pure blocks (or similar) in your fuge and even hid some in your display if you can, copepods can fit in the little holes of these and amphipods can’t. You can also dose some live phytoplankton (might as well order it with the copepods) which will help feed the copepods and encourage them to breed. I’ve also noticed a massive increase in pod population every time I have any sort of bacterial bloom, so you could maybe try adding some bottled bacteria to see if that will increase their population.

I would focus more on providing safe spaces and food for the copepods than on eradicating the amphipods, as you’re just not going to be able to get rid of them. I might even get rid of the six line as I don’t think it’s going to make a huge dent in the amphipod population and removing anything that you can thats eating copepods will help. And lastly, make sure to feed you scooter (and six line if you keep it) heavily so that they’re less likely to eat pods, which will leave as many as possible for the mandarin (and keep trying to get it on frozen, try baby brine shrimp).
 
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JonnyTorch

JonnyTorch

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The mandarin is the only real issue. If the scooter/oscillated dragonet (they aren’t blennies, not even the same order) is eating frozen food, it’ll be fine (obviously having copepods to eat is the better option, but it won’t starve or be malnourished eating frozen). In terms of boosting your copepod population and mitigating the predation of copepods by amphipods, I would put some marine pure blocks (or similar) in your fuge and even hid some in your display if you can, copepods can fit in the little holes of these and amphipods can’t. You can also dose some live phytoplankton (might as well order it with the copepods) which will help feed the copepods and encourage them to breed. I’ve also noticed a massive increase in pod population every time I have any sort of bacterial bloom, so you could maybe try adding some bottled bacteria to see if that will increase their population.

I would focus more on providing safe spaces and food for the copepods than on eradicating the amphipods, as you’re just not going to be able to get rid of them. I might even get rid of the six line as I don’t think it’s going to make a huge dent in the amphipod population and removing anything that you can thats eating copepods will help. And lastly, make sure to feed you scooter (and six line if you keep it) heavily so that they’re less likely to eat pods, which will leave as many as possible for the mandarin (and keep trying to get it on frozen, try baby brine shrimp).
I have marine pure blocks, chaeto, and ceramic and I also have a sponge/carbon in the overflow. I also dose Phyto daily. The mandarin is 1" long, his mouth can't handle anything over a single Copepod. I have safe places for Copepods, but the amphipods are just outnumbering all of them. Man I've added upwards or 10 bottles of Copepods in 2 months before, ( tisbe and tigs), and all I see are amphipods when I look. Hundreds of baby amphipods, which will only grow larger.
 
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JonnyTorch

JonnyTorch

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The mandarin is the only real issue. If the scooter/oscillated dragonet (they aren’t blennies, not even the same order) is eating frozen food, it’ll be fine (obviously having copepods to eat is the better option, but it won’t starve or be malnourished eating frozen). In terms of boosting your copepod population and mitigating the predation of copepods by amphipods, I would put some marine pure blocks (or similar) in your fuge and even hid some in your display if you can, copepods can fit in the little holes of these and amphipods can’t. You can also dose some live phytoplankton (might as well order it with the copepods) which will help feed the copepods and encourage them to breed. I’ve also noticed a massive increase in pod population every time I have any sort of bacterial bloom, so you could maybe try adding some bottled bacteria to see if that will increase their population.

I would focus more on providing safe spaces and food for the copepods than on eradicating the amphipods, as you’re just not going to be able to get rid of them. I might even get rid of the six line as I don’t think it’s going to make a huge dent in the amphipod population and removing anything that you can thats eating copepods will help. And lastly, make sure to feed you scooter (and six line if you keep it) heavily so that they’re less likely to eat pods, which will leave as many as possible for the mandarin (and keep trying to get it on frozen, try baby brine shrimp).
Also my scooter is FAT, he's a sausage.
 

Tft12

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I know you mentioned your mandarin being small but you may want to give live white worms a try, maybe as something that could get that fish by until you figure out something better.
 
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OrionN

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Remove the Six line. The dragonettes will eat the baby amphipods and baby copepoes. Mature copepods and amphipods are too big for dragonettes.
Regardless, a 20 gal isn't large enough for you to keep two dragonettes in it. It does not mater what you do, it is not going to end well unless somehow you get them to eat prepared food. You can also become a slave to your dragonettes and feed them newly hatch brine shrimp daily with one of Paul B dragonet feeder.
 

Tchung23

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Remove the Six line. The dragonettes will eat the baby amphipods and baby copepoes. Mature copepods and amphipods are too big for dragonettes.
Regardless, a 20 gal isn't large enough for you to keep two dragonettes in it. It does not mater what you do, it is not going to end well unless somehow you get them to eat prepared food. You can also become a slave to your dragonettes and feed them newly hatch brine shrimp daily with one of Paul B dragonet feeder.
Agreed. You need to get them on prepared foods. Once that happens you’ll feel much better. I remember the day my mandarins first started eating pellets. I was awesome.
 

Daniel92481

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I have marine pure blocks, chaeto, and ceramic and I also have a sponge/carbon in the overflow. I also dose Phyto daily. The mandarin is 1" long, his mouth can't handle anything over a single Copepod. I have safe places for Copepods, but the amphipods are just outnumbering all of them. Man I've added upwards or 10 bottles of Copepods in 2 months before, ( tisbe and tigs), and all I see are amphipods when I look. Hundreds of baby amphipods, which will only grow larger.
I would agree that your wrasse, scooter, and mandarin might be too many pod hunters for your tank. Then add the amphipods too. These captive bred mandarins are pretty hardy though. I heard from someone that a way to tell if your mandarin is fat and happy is if you can see their spine or not. I really wouldn’t worry about it too much. They eat the smallest of pods. I see mine picking all day and can’t even see what he’s picking at! +1 for TDO pellets. Packed with nutrition that really brings out their colors.
 

jazzfisher

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If you got your mandarin from Biota, they were trained to eat frozen & pellets. Jake from Biota suggested the TDO pellets like TChung23 said. It’s the smallest ones called B1. But my Biota also ate frozen from the day I got him (also tiny).
 
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