I have a 55G tank, and was wanting to get a Frogspawn, and possibly a hammer. Do you think it will be necessary for me to does dose calcium/alk? Would my 10-15G water change every 2 weeks be enough since it would only be 2 corals? I will probably use some B-Ionic if necessary, just wondering if water changes would keep the Calc/Alk up since there is not a ton of corals using it?