I add 3 caps for a 25 percent water changer weekly , that's for 150galways always always rinse out your bio media, this includes noodles, matrix, sponges, pads everything in old tank water. treated tap water kill your bio media, putting you back in cycle. add prime for tank size, not water replacing BEFORE you start filling the tank. I personally use a 5g bucked with the tanks emptying into it while i rinse out my media in it.
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