I set up a HOB refugium on my 20 gallon today, was wondering if anyone had any suggestions of what i may want to put in it? ( been a few years sense i used a refugium, it has been in storage till earlier this week ) I put a layer of sand, some algaes i had and a little wall of live rock. Anything else? I put a little light which i am planning on upgrading next time i go to my storage unit.