molliwopp
Aquarium Advice Addict
Anything restricting their flow . Dont let it worry you too much though, im not saying it isnt nessesary but dont let it stress you out, its actually quite easy. Usually 2 in opposing corners will makes a circular motion of water current in the tank. Keep decor away from touching the sides of the tank and the water should have no trouble at all circulating properly.
Placing them at different heights ensures circulation to both top and bottom.
Placing them at different heights ensures circulation to both top and bottom.