pattern

I noticed in on my rocks. I have no idea what it is. I have 2 clowns, cerith snails, nassarius snails, 2 scarlet hermits, 2 blue dwarf hermits, and an emerald crab.

I noticed this strange pattern of stuff on my rocks. I have no idea what it is. I have 2 clowns, an emerald crab, 2 Scarlett hermits, 2 blue dwarf hermits, cerith snails, and a nassarius snail l.

Hi all, I have a 5'x2'x2' tank with two Tunze 6105s that are connected independently and correctly to my Profilux 4. Up until now I've just been sort of blasting water flow all over and am now looking to fine tune my flow and start to lock in my coral placements. I'd like to create a gentle...