Hi I'm building my own CO2 reactor for a 90 gallon tank. I have a magnum 350 canister filter and a 1200 GPH pondmaster in my Wet/Dry filter. I plan on hooking the reactor up to one of these. My question is I have found the parts to make either a 3 inch reactor or a 2 inch reactor, which would be better, and with the pump/filter I have will I be able to push enough water through a 3 inch reactor? I was also wondering if brass fittings are a no no? Any help would be greatly appreciated. Oh the reactor will be an inline reactor.