What is a safe GFO to use in my reactor to remove phosphates.Would like a few to pick from.
They should all be safe assuming they're a decent quality GFO. BRS sells a high capacity GFO, which is what I use. Just make sure to start off slow, or you will run into problems. SPS don't like getting stripped of phosphates which is what could happen if you were to use the full amount of GFO on day 1. I typically begin with 1/4 of the recommended amount, then slowly work up over a period of a few weeks.
Most people use the gfo from bulk reef supply