ok ..I have never used kalkwasser ( i know you must be careful with it) I have a 220 tank with just a couple of corals..like as in 4...and a 50 cube with maybe 5-6..want to add some..when i test the dkh on the 220 it averages 8..a low i have seen is 7.8 on it...the 50 cube averages 8..i have seen a low of 7.2..what is idea..I dont have sps really just lps mostly..im thinking..if i use a small amount of kalkwasser in my ato on these tanks would that be the stability that i may be missing..ive had mixed results with my coral frags...is kalk us a bad idea until you have lots of corals? I was thinking I could try like a half teaspoon in the 2.5 ato reservoir of my 50 cube..and my 220 holds 15 gal ato..maybe two three teapoons in that..just enough..whatever that is..to keep thing stable..is this a bad idea?