fish aggression

I have an unknown bully in my tank as I haven’t caught who the culprit is that’s attacking my fish. I had a beat up red firefish that died last week. My newest addition, a yellow/purple wrasse, and my purple firefish have both had their tails messed up and keep getting attacked by an unknown...

So I have a 32g Biocube stocked with a yellow banded possum wrasse, a skilletfish, and most recently a Wheeler's goby (+ tiger pistol shrimp). The Goby/Shrimp were added just over a month ago and are both pretty close to their full size. I didn't really notice any problems initially. The goby...

Every time i try to spot feed the corals that benefit from consuming meaty foods, or my nems, these two go on a spree ripping food from every tentacle in the tank that has ahold of some. Is there anything I can do or a product to use to protect the corals while they eat? My poor lobo and...

Please help! I have two pajama cardinals, one of which hates the other. Now I’ve had three newly added fish die mysteriously. Each of those fish weren’t added all at once. Let me premise it this way, all my water parameters are excellent, did water changes after death. I had a sailfin, then a...

I got a great deal on a used 180 gallon waterbox, with everything needed. I was looking at a 125, but this is cheaper and has all the equipment including 3 radeon g5’s. Of course, I jumped on the deal and the tank is arriving on the 7th. I don’t know the exact model but it’s a 5 ft tank, the...

I have 180 gallon Peaceful community but I put a red pot blenny in there 2.5 moths ago, and the blenny is a terrorist. He use to pick on the one spot Foxface, but recently, he started to pick on my cowfish. The blenny swims up quickly and bites the underside of the cowfish. When I stick my hand...

I recently bought a pair of banggai cardinals. They were and still are really small and couldn't be sexed. They've been in my tank for over 10 days now. One is very active and is eating well and swimming throughout the tank. The other hangs out in the top corner or at the back of the rock...

I have a 6 lined wrasse who I suspect is behind the death of my latest three fish additions. He was added about 8 months ago, and was the last fish that survived being added to my tank. Since his addition, I've tried to add a yasha goby and two banggai cardinalfish. The yasha disapeared...

I have a 36”x12”x18” tank and was planning the following stock list, but was curious about a fifth fish: 2x clownfish (probably ocellaris) 1x royal gramma 1x orange spotted goby For a fifth fish: A firefish, hawkfish, Blenny, splendid dottyback, or carpenter flasher wrasse although I imagine...

Have you had experience with blue streak cleaning wrasse attacking fish? What can I do to make the environment better. The fish have been in the same tank for about 6 months with no issues. Ours has been darting towards our Midas able. Y nd now he is afraid to come out. Every time he tries to...

Hey guys, Ive had this orange shoulder tang for a month or so now and about 2 weeks ago my other tang bullied him and he hid a lot. He wasn't eating and had damage to his tail. He's slowly been coming out again and being more active, but I noticed that he now has these weird marking on him and...

Hello. I would like to know, in your experience, which fish is more peaceful: Pseudochromis fridmani (Orchid Dottyback, also known as the Fridman's Dottyback) or Gramma loreto (Royal Gramma)? Will there be trouble with Blue Sapphire Damselfish (Chrysiptera cf. springeri) or Firefish...

I have a IM 25 Lagoon and have 4 fish at the moment 2x Clownfish 1x Pygmy Cherub Angelfish 1x Rainford Goby I have had the Angelfish and Clowns for over 3 months now and have tried to add 3 new fish to the tank since. Every time I add a fish the Cherub Angel attacks and harasses the new fish...

Hi, I’ve had this Vlamingi Tang for a couple months now and he has been a family favorite. He is super friendly, eats aggressively, gets along with tank mates (Invited my Vampire Tang to school with him and other fish after a day), and overall a super great fish. He has never shown any negative...

Hey y'all! I've been wandering if i could keep 3 pairs of clownfish together in a community tank and just how big that aquarium would need to be. Do any of you have experience with something like this? Maybe i could put two anemones on opposite sides of the tank and a third one somewhere in...

Assume: All fish are introduced at the same time Proper filtration All fish quarantined Mix of tangs from nasos to kole tangs. ie 1 or 2 of each species Thank you!

We've had a powder blue tang for about a month with no problems. Last night something beat the hell out of her. Chunks missing from fins. We have not added any new livestock and I have never seen anything harassing her. I've got her in an isolation box but she's not doing well. Anything...

Hello! Im working out what fish I would like to keep for a waterbox 110.4, which is 48 inches long. and around 20 inches deep. I plan on making it a sps tank. Can anyone review the fish choices here? From my research i don't see any major conflicts going on, but i would like to make sure just...

Hello, I had a quesiton, could I have two sailfin tangs, a unicorn tang and a yellow eye kole tang together in the same tank. Currently In the tank is one sailfin tang that has been there for about three months alone.

What’s up guys, after having fun with my fluval 13.5 I decided to finally get an actual sizable reef tank a NUVO 40L, so now I’ve got the tank setup and cycling and I’m planning out the stocking choice for it all. I want to make a mixed reef with this tank but I also want some more interesting...

Yesterday, I got a QT'd midas blenny that I had in an acclimation box overnight and none of my fish paid attention to it. This morning, I released it into the tank before the lights went off and my starry blenny is going after it. The starry blenny is significantly larger than the midas blenny...

My diamond watchmen goby just attacked my mandarin dragonet! He isn’t hurt that bad but he will in the mouth of the goby! His tail fin is cut up a bit but he doesn’t seem too bothered. Will he make it through??? :(

There are several techniques for catching a fish out of a reef tank. None of them are perfect or work equally for all fish, and many require time and patience. I have a 330 gallon mixed reef that's about 16 months old. In the past year, there have been a couple occasions where I've needed to...

Hi guys I am finishing up stocking my 210 gallon reef tank qnd I am ready to add my tang gang I had planned on adding 3 of them but can't decide on the mix so I am looking for personal opinions on what has worked for you to avoid aggression. Trying to decide on a tomini, yellow, purple...

Hi. My aquarium is almost a year old. Got bicolor who’s slightly bigger attacking everyone especially flame. Yesterday I added another 40 pounds of rock, built plenty of extra caves. But they’ve been at it for few days ever since I got them. First one died, didn’t make acclamation so bicolor...