I have a few tanks with Kois and one is a 90g tank which houses two 16". I do large water changes, add some Prime, run charcoal with multiple foam filters. No gravel in the tank as they are very messy fish and makes cleaning alot harder. Never had issues with the large water changes, but I think the key is I have lots of water circulation. Dirty water will lead to infections.
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Mike
150g reef, 55g sump, T5's, Vertech 200A, Profilux III - German made is highly over rated, should just say Gerpan made.
Reefkeeper - individual obsessed with placing disturbing amounts of electricity and seawater in close proximity for the purpose of maintaining live coral reef organisms.
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