aggression

I am well aware wrasse of the genus Thalassoma specifically Lunare, Hardicke and Paddlefin are extremely aggressive and will destroy a cleanup crew. I know they can also bully small fish but is it true wrasse of this genus will actually prey on small fish as well? Would damsels, anthias...

A few weeks ago i bought a coral beauty for my 40g tank. 2 days ago I bought a fire fish. I was planning on getting 2-3 because I know they are better in groups, however the fish store only had one. I put the fire fish in that night, and the next morning i couldn’t find him. I assumed he was...

Hello! I have 2 tangs, a purple and yellow. They have a habit of ganging up on certain newcomers (killed a powder blue tang and a coral beauty angel on seperate occasions). Right now I have a copperband in the tank with a partition up so the tangs can't get her. To avoid aggression I thought it...

I added a yellow watchman goby to our tank last week and my tailspot blenny immediately started attacking. I put the ywg in an acclimation box for six days and let him out yesterday. The attacking is slightly less persistent but still occurring regularly. I have to sit next to the tank and waive...

I have a trigger I’ve had in a QT tank waiting to cycle meds but I wanted to add a couple more fish to it before starting the cycle. I added a decently large diamond Goby yesterday and walked down this morning to it dead and being picked at by the trigger. Anyone had this trigger kill other...

Due to some aggression in my tank I am in need of rehoming a Scopas Tang. Huge bummer as it's a beautiful fish. I currently have the scopas in the empty refugium section of my sump where it can also enter into the skimmer section (skimmer is off) and uses the skimmer to hide behind. The tang is...

I've heard probably most people say they had huge aggression issues with six lines, and a few claim they were model citizens. I would love to have one, but I'm wondering what circumstances you've had that resulted in aggression or peacefulness? Specifically tank size, other inhabitants, and also...

270gal tank - So we have a resident Moorish Idol of about 2 months I think. We attempted to school by adding two more. The original is relentlessly attacking the two new Moorish Idols who are larger. We’ve moved the bully to the 93g tank and the purple tang is now attacking the Moorish. Is it...

Hello, I have a 300 gallon FOWLR. It has baby horn shark (it’ll be moved to a 500 gallon in a year or 2), a 5 inch miniatus grouper, a Niger trigger, a powder brown tang, a blue ribbon eel, a clown that came with the tank who holds his own well, and a 4 inch hi fin snapper. Everyone’s been...

Help! My daughter purchased a Lawnmower Blenny for my birthday to replace my previous one that went missing and never reappeared. Since being introduced, he’s been very territorial towards my existing goby. Will this behavior continue or can it be reasonably expected to go away? My display is 75...

Hey guys. Wondering if this is possibly Brook or some scale damage. To me, it just looks like the scales are lifted a bit BUT lfs said clownish dont have scales. I went to another lfs right after (first one didn’t have what I came there for) and figured I would ask there. They told me that...

Hi! I have a 40g community tank with lps and soft coral. I have about 45 lbs of live rock. I have: 1 pajama cardinal, 2 clownfish, 1 diamond goby, 1 purple fire fish, and 1 citron goby (the bully). For inverts I have about 10 hermits and 15 snails, a skunk cleaner, a fire shrimp, 2 peppermint...

Why does the chromis keep hanging around my clownfish like this? The clown obviously doesn't want him there and charges at him, but I've also seen the chromis bite back, no matter where the clown goes the chromis continues to hover around him. Is there some way to stop this? Let it run its...

Hi there, I have a question about the aggression of the Blue Devil Damsel. I transferred this fish into a new red sea reefer 350 & sadly didn't research its aggression towards new fish. I've had this guy for over a year in a nano tank with a clown. It was bullying a new firefish for the first...

Recently added a coral beauty to my 120 tank. It started fussing with my clownfish now both have faint white blemishes. It is a little tough to see because a diamond goby is busy stirring up the sandbed

I have had a clownfish harem tank going for about 2.5 years now. I have 13 clowns (some kind of Picasso) and 50-60 green bta anemones. The clowns were all from the same clutch added at the same time as teeny tiny babies. All has been well until this week when I’ve been noticing quite a few...

I received Melanurus wrasse May 23rd, 8 days ago. The photo above shows the second day after losing some scales. It did not show any symptoms the first day, but overnight it lost scales and now I can see some red sore. It's in qt with scopas, starry blenny, and sixline wrasse I isolated...

Hey guys, got a peppermint shrimp today and my royal gramma started picking at it like crazy. It found a place in the rocks where the gramma won’t reach it though. Is it gonna be like this long term? I used to have a smaller one but he disappeared one day. Could the gramma have actually eaten...

Does anyone actually have/had one of these guys? They are currently my dream animal and I would love to own one Probably 99% of the threads on every single forum are full of people saying 'i dont own one but this one random website says ________' and honestly i dont believe half of the things...

So I just got two young Ocellarus clowns, both very small but one significantly bigger, and they're still in QT at the moment (I've been doing tank transfer). They'll be ready for the 32 gallon display tank by May 2 at the soonest since they haven't shown any symptoms of anything so far and are...

Hello all! So a while back I got one of my dream fish, a super young springeri dottyback. Super cute dude, aquacultured, love him. I quarantined him with a Flametail blenny, and introduced the two together into their tank. A couple of times the flametail has chased the dottyback off, but other...

Good evening, I am kind of panicking since I am not sure if this fish behavior/temperament is going to cause stress/death :( Background: 8th month of running a 33 gallon waterbox bare bottom tank with ~25 pounds of dry rock and 1 bag of bio sphere in the sump area. 1 Banggai cardinal added on...

Hey everyone, the hobby has been somewhat of a passive one for me in the last year, but that has sort of changed recently. Anyway, i would love to get a clownfish pair, but I don’t really see the appeal of the usual perc complex clowns. The ones I’ve been really drawn to have been Maroons...

I recently purchased a Long Nose Hawk, A Clownfish and a Cleaner Wrasse. For the most part, everything has gone well except that I have noticed that the cleaner seems to target the Long Nose Hawk disproportionately compared to the other fish for his cleaning service. The Long Nose hawk appears...

We've had a midas blenny for about 3.5 months now, and had no problems with it at all. Super active, interesting fish that didn't seem to care about its tank-mates. Then, about 3 weeks ago we got a blue hippo tang, and more recently a kole tang. Midas blenny keeps biting them, especially the...