I recently bought 2 clams ... a 2" maxima amd a 1-1/2" somosa (sp). I have a 90 gal tank with 2 175W 10000K MH and 135W Smartlite. Just read post on General Discussion saying small clams need to be fed phyto daily .... even removing them from tank to small dish for daily feeding. I feed tank a mixture of frozen brine, 3 tsp DT's phyto, and 1/8 tsp of zoo every other day. Twice weekly I add a small amount of golden pearls. Want to make sure clams are well fed! Is this enough?