Can You Use Bricks in Aquarium

If I remember correctly, bricks are extremely porous. the only thing i would worry about is how abrasive they are to the fish if they were to run into them. so if you could get some smoother ones, that would be good.. Also, make sure none of your fish can get stuck in those holes!!

What materials are safe for aquariums?

Among the stones safe for use in aquariums are natural lava rock, natural slate, natural quartz, natural river rock and petrified wood. Be sure to boil collected rocks for an hour before placing them in your tank. Lace rock, which is available at Bob’s Tropical Fish, is a wonderful choice as well.

Is cement OK for aquarium?

All portland cement products are aquarium safe. This is basically every cement/concrete mix you will find. Just avoid anything that says “modified” or “polymer modified”. The drawback is that it must be cured for at least a month before it is stable enough to not cause changes in your pH.