alright so i plumbed in a 20g frag tank into my main system. Run a quite one 3000 return on it and a koralia 1050 as flow.

what i can't figure out is why HA is only growing in my frag tank and not my display?!?! and its only growing on the frags....

the only thing i can think of is maybe the bulbs are bad? but they shouldn't be that old...any ideas?

im getting sick of taking frags out and brushing them with a tooth brush to remove the algae growing over the plugs....