Always seem to be adding something colorful every week . Never knew this is one expensive hobby. Just got over my zoa and poly fever. Maybe rics are next, just ordered some from the group buy this month. Quick question on Phosban reactors, are they necessary to run? I been having problems with the cc sandbed, the top layers get dark and kind of stick together so I siphon it up with every water change, now very thin layer of bed, will the phoban reator help take care of that or is it something else. Thanks.