Aiming4 Goldfish Care

I have a 75 gallon tank. I had three Oranda goldfish, a black Moor and Lionhead. Very awesome looking fish. They were dong great but after a month or two, they all died at the same time. I tested the water and the nitrates and nitrites were very high. We used Kordon AmQuel Plus to [...]

Ok first thing i have 20 gl 1 under gravel fltr 1 power fltr - 1 standart fltr so there is 3 filter on my tank with 1(3") Fantail goldfish - 1(1") Bubble eye goldfish n there is no problem week by week when i care my fish with cleaning n etc.
But last week [...]