So I had bought a large 8 gal container to setup as my ATO for the frag tank yesterday. I did all kinds of wonderful calculations on the dilution of the kalk solution, the amount of evaporation/day, and the daily uptake of alk from the system... felt all smart for calculating I needed to supplement 0.4 dKh/day with a 0.21 gal/day evaporation rate with a pump that could pump 3.5 gph, and mixed a nice little 33% saturated solution of kalk top off water to dose with.
I setup the whole system and plug it into the Apex, turn it on to test, then turn it back off... program it to come on for 1 min every 6 hrs... come back in horror about 30 mins later as my pH goes from 8.0 to 8.7 and my alk jump from 8.0 dKh to 10.0 dKh.
All that and I forgot to plug the pump I used, the Tom's Aqualifter, to either the 4th or 8th port on the EB8 (for those non-Apex'ers, the 4th and 8th port are used for low voltage devices as they sometimes get stuck in the on position otherwise). So basically on my first test run, I dump about 2 gallons of kalk saturated topoff water into my frag tank.
Luckily my corals are battle-hardened and most are ticked but okay. [emoji4]