there seems to be a back flow so the airline has water in it, the pump is rio 800, it produces very little bubble, i tried using the rio 1100 and there was no bubble at all, then i tried accela 1000 but still no bubble at all. So i am thinking may be i should be using very slow pump ..may be rio 600 or accela 600. My thoughts are the high pump doesn't work because of the big hose 5/8" that caused the back flow of water into the airline, so the smaller pump use only 1/2" and will have more pressure. (i am talking about the hose that connects the pump to the hob refugium intake). let me know what i am doing wrong. =)
Thanks guys
Todd