Rapid deterioration of domino

I have a 10 gal tank with 1 clown and two damsels one domino and one three striped. It's been running great for about 3 months. I'm in the process of setting up a 30 gal and converting 10 gal into sump.

In the span of about 8 hrs first I noticed the domino with some mouth fungus so I treated with melafix, but my clown started behaving real aggressive toward the domino by half way thru the day it had beat it up pretty bad so I had to separate it in the tank but I think it was too late it's eyes started bulging and it started swimming poorly. all this with water quality within safe limits.

If anyone has any ideas please let me know, they have been together for three months and their behavior has been fine.

Thanks,
Trey

 

Are they all still in the 10 gallon? Or have you started to move them?

Perhaps the domino is/has been being harrassed and just began showing the fungus as a result of stress.

Those are all pretty feisty fish to have together in a 10 gallon!!

I don't know how you maintain water quality in a ten gallon with five fish! What do you test for ...and also, what is the setup, eg. filters, lights, amt of Live Rock if any...etc. We can help you better with some more info ;D

 

Ther are 3 fish from what i read....but wierdly put. I agree, too violent and territiorail for any small tank, lose the damsels even in a 30. They will murder eachother once they mature if they are males. I would go with a canary wrass and a basslet for color and compatiblility if your LFS gives store credit....but they may do ok in a 30.

 

+ the clown.

 

right! 3 fish...my bad! :-X

 

Tank equipment consists of penguin mini bio-wheel filter
with flouresant lighting. 2 qts live sand and crushed coral substrate, lace rock base and several live rock and coral frags( mushrooms and polyps) which all seem to be growing and doing well. Macro algea grape cul.

Inhabitants include the clown and two damsels, with a couple turbo snails and several blue legged hermits.

And all have been fine until now. water quality has been good. my LFS does a full water test weekly and I have been doing a 10-15% water change every 5 weeks. I do a dip test a couple times a week to keep an eye on things but I'm beginning to tell just by looking at the tank when nitrites/trates are creeping up but they have continued to cycle well without much medling on my part.

Thanks for any imput,
Trey

P.S. I have not set-up the 30gal yet I plan on letting it run about a month before I start adding much to it. Probably just a few cheap damsels to get it cycling.

 

Well I wasn't logged in but this is my tank info above!!! :