I've had a dual reactor running for about 24 hours now. I tested the water before I installed it with a Hanna phosphate checker which came up at 0.00ppm. Most of the phosphates are probably locked up in the algae in the sump and what grows on the DT glass. I cleaned the glass so we will see if it grows back as fast or not.

I decided to run half of what the BRS calculators suggested in an attempt to not shock my system. I'm always paranoid about adding something new to an otherwise stable system, you never know what could go wrong.

On that note, where does everyone have their reactors? In the sump or outside? I'm somewhat uneasy about pumping water out of my sump, into reactors outside the sump, and back in. If a connection fails it could drain the sump. I don't have an ideal place to put them above the sump, and I don't really want to. Mine are currently sitting in the stand next to the sump.