Went through your thread. I am no expert and have had my own issues as I am new to the sps thing as well sounds you have good lighting for what you wanna do Check, internal flow is a must with the sps, Example I run a 4ft tank internal flow total about 5500gph coming from 5 locations not each, total all together. Is it too much flow dont think so I have 2 mini dead spots area of 8x8 in each side corners. any who didnt see if you have a controller to shut things off in emergency situations like a heater gone crazay which they do, or a chiller that turns on when its not suppose to...happens read a few threads of people trying to hold the tears, and all could have been avoided with a simple controller I'm sure you know they go anywhere from a benji to 5 benjimans so like in your case you have a cal reactor which I am impressed as I myself am not ready for one, but since you have one your controller could shut it off if the ph gets to like 7.5 or something like that. Sorry ranting, good luck, I wish I had just ponied up the extra grand and bought the leds I liked and not worried about chillers and fans etc... such a waste of electricity and multiple machines to keep metal halides