Recently one of the two Koi angelfish in my 30 tall has gotten sick and is showing no signs of recovery. I did a 15 gallon water change on it today but no help yet. I have been battling high nitrate problems in my 30 for months and I think it finally got to him. I want to know if once my 75 gallon is done cycling whether I should move my other healthy angel into it to avoid any possible sicknesses it may get from being in my 30 gallon. The fish currently in my 75 are 6 giant danios and 1 rainbow shark. I was also planning to add one or two other peaceful cichlids such as smaller geos or kribensis but definitely doing a severum. I can change my stocking plan of everything but the ones already in the tank but I am definitely doing the severum like I said. If I can't put the angel in the 75 I will try to base my 30 tall around it to make sure it stays healthy. What do you guys think I should do?
