Who Gives A Fish Forums

Man, I blew it with my first reactor by cranking the CO2 too high. Corals looked pissed for days. Now I keep it chill at 1 bps and let the controller do the work. You using a media chamber or just straight reactor?

Also, if you're still having issues, try a smaller diameter hose. Less water volume to move means easier suction. Just gotta go slower.

Nah, hose length shouldn't matter as long as it's got a good drop. Maybe your siphon's just weak sauce. Try a different brand, like the Aqueon one. Works like a charm for me.