native tank

I have a 250 gallon native tank with bluegill, crappie, walleye, and yellow perch. Recently I had a walleye and a crappie die for unknown reasons. Ammonia / nitrate / nitrite are all reasonable, but not perfect. My suspicion is that they are dying from disease introduced by the feeder fish I...

Just took some more photos of my native goby tanks. Ok, native to Dniester River))) I have 3 freshwater species of gobies in there: monkey goby, round goby, and toad goby. Toad goby ( Mesogobius batrachocephalus) is the largest one, but he only comes out when he is hugry, so I couldn't get any...