i have a 55 gallon tank, artifical plants, and a home made background i saw on youtube where you glue lava rocks to gutters and put it inside the tank, looks amazing.
i HAD two koi fish and 4 big gold fish and they died, i dont know why, i tested the water everything came back safe, i did a 100% water change and let it cycle before adding more fish, i bought 6 more gold fish and they seemed like they was doing okay, so i got a koi fish, within 48 hours all 6 gold fish died, and now my koi is swimming at the bottem,(the same thing the gold fish did before they died) what could be killing them?? should i do a 20% water change??
also with my air bubble rock(more like an air bubble strip) is producing the bubbles like they should but they are not breaking at the surface once produced, they are spreading out across the tank, some of them slowly popping, some floating towards the filter and getting pushed under water then back up. is that okay?