know of anyone who's built one? i have a 60 gallon reef and im sick of dosing with b-ionic and id like to use the cheaper kalk and boost my calcium levels even more but its not plummed for a sump and since i live on the second floor of an apartment complex flooding isnt exactly a risk id like to take. i use a hang-on cpr back pak for a skimmer, has anyone built a hang-on calcium reactor?