crabs new 24" cube

[i have crabs]

when i built the sump i think i over complicated things tryin to make shure i had options and i have been kinda annoyed workin with such a small cramed sump area so originally it was split into 4 areas,first the drain flowed into the top left which i had seperated from the bottom left so i could fill with live rock rubble or chunks, the bottom left is for the skimmer, the right top was a small fuge that the return pump supplyed water too and the bottom right was where the return pump sat.. if that made any sense
anyway i decided to pull out the baffles seperating to left side to have more to hide the brs reactor that i run carbon/gfo in, after about 2.5 hours getting the skimmer out and tryin to cut out a baffle the glass exploded in my hands gining me about 50 very nice cuts to my hand, some were fairly bad but i wasnt done so i got to keep workin in the salt water for another hour or so which was lots of fun but it least its finally handled. on the right hand side im gonna remove that baffle also and not run the fuge so i can have the room to add a kalk reactor, adding the 2 part was really getting to me and i couldnt believe how much i was using so i hope a kalk reactor will cut down the work a bit, i dont have a auto top up so is it possible to just run them with a powerhead with the reactor releasing x amount of drops per second?