so i have a 29 gal with 2 96 watt pc bulbs over my tank, when i was at the lfs and bought my mushroom rocks they where large and spread out, but now i my tank they seem to be half the size, all my parameters are good, no ammonia, nitrite, and my nitrate is at 10 mg/l, i dose calcium, and rarely a little microvert, is there something else i need to dose to help these guys enlarge to where they where at the fls