this is my first time for softies exept for the nennie, need some advice, running 3 t5 54 wats 18k 12k and coral blue
Be carefull with that stuff! dont dose too often!
To be honest .... I dont even use that...my corals live off the extra frozen foods and flake that i feed my fish.
It may be beneficial with SPS for some people, but softies, LPS and Nennies are cool with just some frozen food!
Cant see the whole urchin. If he's the standard black one with and orange/read head (actually the anus) then it should be fine. They just a pain sometimes cause they can grow quite quick and tend to knock over corals etc. they also eat some beficial algaes including coraline algae off your rocks.
Also...need some specs of your tank before one can be certain on advice... size/volume, skimmer, powerheads/"wavemakers", etc.
Would be concerned about that nennie with so little light... is that a Magnifica anemone? How long you had it?