O.k. I went into your profile and see the tank is only 4 mos. old after the conversion. It is undoubtedly still cycling and re-settling. The tank needs to "season" awhile. Where are the GSP as far as location? Mine are way up in the tank and get a lot of flow and they are growing (as some say) like weeds. Post a pic. Also, you need to know what someone else mentioned; Calcium, Alkalinity, SG, and Magnesium levels.