I have to admit, I never used to do regular water changes (actually hardly ever did 'em at all), but I've been doing so for the past several months & I do see a positive difference with my corals especially. However, my tanks are heavily loaded & fed, so removal of excess nutrients may be more important for my tanks than for others with lightly stocked, underfed tanks with heavy filtration/skimming.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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