Okay I have a smallish tank (20 gallon high) that is a full on reef looking really good and (fairly) stable. I'm interested in getting a clam, but the folks on my local reef club forum have me a tad nervous. They are suggesting I add a controller and dosing pumps so that my calcium and alk are more stable. As currently I manually dose, and keep my calcium no lower than 440, no higher than 480, alk is tough to keep up, but I'm slowly increasing the supplements until I can maintain it between 8.5 and 10. pH is stable at 8.2. Nitrates are less than 2 (all these values are tested via a set of LaMotte kits I spent way too much money on). Anyway, what do you guys think? I've got a 70W MH suspended 4 inches over the water, and if I get a rock boring (maxima) clam I could have it as close as 4 inches from the water's surface without difficulty. (no one from the club seems concerned with the lighting being its HQI). Thanks in advance!