I thnk I have the same on as squishy. I was really worried about it at first for reason allready mentioned but after an ich problem I added it and have never regretted it at all. My Ich slowly went away, any sign of hair algea went (Not sure if related to uv though), and my tank is doing great in my opinion. I can't get rid of zenia fast enough, my brain is happy, my clam is fine, all inverts are doing great, and growing, I have not added or changed anything to my setup in a year. All I ever do is flip snails back over, add baking soda every night, feed and do bi weekly water changes, and everyone is happy and the tank looks like a well established thickly growing tank IMO.
CG