I do 90% water changes for my Ranchus every 4 to 5 days. Because Ranchu, like all karps, are filthy, dirty fish that produce a ton of bioload. As for filters, I used to only use 3 extra large sponge filters, but turns out my water parameters suffer still. So I added a hydra filter, and now my water parameters are always absolutely or near perfect each time I test the water 😊
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