So I need to add more cuc to my 32 gallon Biocube. I have 5 trochus snails (although there’s only one that’s mature and 4 are almost penny size) and 8 astrea snails. I have cyano and detritus building up on the sandbed and a little bit of film algae on some of my rocks (cyano and detritus are my main concerns though). I plan to get a fighting conch (or some kind of conch), nassarius snails, and a few more trochus snails. Also…. an urchin? Should I? How many of each would you recommend?