hello. I have about a 4" datnoid that has been battling cloudy eye and possibly pop eye for about 3 weeks now. I have him in a 40 gallon breeder for over a year and I upgraded to a 75 gallon.( I know this is not sufficient for him full grown, but when he gets to big I will sell him to somebody who has a big enough tank) for now I really enjoy this fish. Anyway, due to space issues I couldn't cycle my tank. But I reused my established aquaclear 70 filter. I also put the biological media from my established aquaclear 50 into the 70. Along with these I added a new aqueon quietflow 75 and a fluval 406 canister filled with biological media and pot scrubbers. Idk if it was a waste but I also used a ton of tetra safe start. It's been exactly 1 month since the tank has been running. My ammonia is 0. Nitrite is 0. And nitrate are within safe zone. My datnoid for the first few days in the new tank looked great. He was eating pellets, had great coloration and was swimming around. Than his eyes started getting cloudy with a few white spots. He stopped eating for a few days. But than he started eating again. Now the past 4 days he stopped eating again and he hides a lot. He also is extremely dark. He will not come out in the light either. When the light is off I will see him out of his cave, but he is not very active. He kind of just stays in 1 spot. Yesterday I enticed him with minnows. I left the light off and threw them in and I saw him gulping them down. As far as his eyes, I have been using melafix for about 10 days. It initially helped a lot but now it hit a plateau and it's not getting better or worse. I tried a little bit of salt. 2 tsp per 5 gallon gradually but I didn't go higher because I didn't want to affect the biological filtration. I gave him a methylene blue dip yesterday but not sure if that helped. I was told my ph was extremely high, and that can cause cloudy eye. So I been using ph down as well. What makes no sense is my tap water is 6.0 ph. But my tank goes right to 7.6. (The highest my kit reads). The fish store is the one who told me it was around 8.0. Yesterday another fish store said I was around 7.2. So I am not messing with ph anymore. Now my only options are to treat my whole tank with erythromycin, or fill up a 10 gallon that I have with the 75 gallon tank water and treat just that with the erythromycin for 4 days. What do you guys think? Without feeding the datnoid and medicating the 10 gallon tank, do you think I can get away without an ammonia spike for 4 days? Or is this a bad idea. Sorry ahead of time for the long post and for any grammar mistakes. I'm writing this on my phone in the work truck. Thanks.
