okie, u can leave most rocks... but make it simple... dun do it with many "holes" cos i ever experience... sh went in .... nvr come out..... only to find them ganna stuck ,died........
north side here, u can find frozen mysis at yishun blk 934-aquastar....5-10 mins walk from yishun mrt..... if not be serangoon north ave 2 ..petmart.
see if u damsel or clown are disturbing the sh not?