[AquaticLife] Under gravel filters
Then, there is the reverse flow UGF, where the water is pushed up through the substrate, either by a canister filter or by powerheads.
\Steve//
Category: Philippines Internet Koi Society
Then, there is the reverse flow UGF, where the water is pushed up through the substrate, either by a canister filter or by powerheads.
\Steve//
Category: Philippines Internet Koi Society