I want to get a calcium reactor for my tank to help keep my dkh and ph at good levels.I'm throwing in the do it myself towel.Is the coralife 250 a good one? My tank is only 90gal and i don't have a whole lot of sps yet. I see other peoples birdsnest coral and then look at mine and want to kick my tank.I am on a tight budget and the coralife seems reasonale.