So this isnt fun at all... 5 of my 6 fish have died in the last week. Im at college and I just come home on the weekends and do water changes, while my dad feeds them during the week. Last weekend I noticed they looked a little iffy, so instead of the normal 5% I did a full 20% change. My dad checked all my parameters during the week, kept on the topoffs and everything with the water was perfect.
I come home friday and 2 fish are dead, so I do about a 20% wc
(despite all tests showing water was fine) The fish all seemed to have something wrong with their skin and some of their fins were ragged. My goby appeared to have his skin like pealing off him. Every one of them was breathing pretty heavily, clownfish was panting and swimming at the top. Since my parameters were fine I figured Id start adding garlic xtreme to help boost their immune systems. This morning (sunday) I woke up to my clown, royal gramma, and goby dead, but my yellow tang looks 10x healthier. His fins look better already, skin appears totally normal (A little more pale than usual) and hes breathing a little steadier.
On top of that, and further proof that it wasnt water issues, no inverts have died. My mushroom coral has grown more in the last couple weeks than the first 5 months i had him, and my polyps are growing pretty fast as well. Feather dusters are all fine, hermits are enjoying their free meals when they get to the fish before I do, snails are all fine
So my question now is... what do I do next? How do i pinpoint exactly what happened? How do I know my tank is safe to move on? Is there any way to prevent this in the future?
Oh and just as an explanation of my tanks, I have a 65 gal fowlr
and a 15 gal
reef linked to the same sump. 2 of the dead fish were in the 15 gal
and 3 were in the fowlr