Hey guys! I have a few concerns about my hang on refugium and figured someone on here would definitely be able to help me out. I just purchased this item from aquatraders and I'm absolutely loving it so far. I got the refugium/skimmer combo package. I did not get a light for it yet! I just set up a new 55 gallon tank so I also did not buy a cheato yet. I'm starting to notice, in the section where the cheato should be, there is some what looks to be algae growing on the bottom. Is this normal? Please help me!!