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i finally found some coral sand :D where do i put it in my tank's filter though? im using the aqua one 620.. its about 20 gallons and so far theres only 2 albino corys in it. :) oh, and can stress coat or stress zyme lower the ph?

cory cats..my favorite.. very playful and active bottom dwellers, they love swimming up and down the air bubbles too :D

My current pH is below 6.0. I measured our tap water's pH and its neutral 7.0 so why does my tank water have a pH of below 6? There is no driftwood in it. Ammonia 0 Nitrites 0 Nitrates about 20. So what makes the water acidic once it goes in my tank? What can I do to keep it at about 7 or...

I read somewhere that it should be about 2 inches but then some say that if it will not be a planted one, then substrate should be kept at a minimum or none at all, but i understand that beneficial bacteria that converts ammonia to nitrites then to nitrates will reside in the substrate. so...