 Re: Overflow Breaking Siphon
Since you stated there is an air removal fitting on the overflow I am assuming your using a CPR. I have the same overflow. A regular powerhead at 135 gph isn't going to cut it. If you are going to use a regular powerhead for this it ought to be 400+ gph in strength. CPR recommends using a rio 600 rejuvinating powerhead ( what I use ) or an Aqualifter vacuum pump to remove the air.
The CPR is a good design with flaws. No matter what air bubbles seem to collect regardless of the amount of flow. I kind of believe the theory that CPR put on the air nipple to solve the problem of air accumulating in the c tube.
Don't get me wrong I love how quiet the CPR is, but it does have design flaws. My regular overflow hardly ever collected air in the C tube and if it did a shake of the tube would move all the air pockets out.
whooo. long post.
Sean
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90 gallon reef, mag 1800 main return pump, 10 gallon refugium + 10 gallon sump, CPR overflows, ASM G-1 skimmer, icecap 660 vho 440 watts. 130#LR and 60#LS. Corals: Finger Leather, Fat Finger Leather, Toadstool, flower pot sps coral, hairy mushrooms. Fish: Yellow tang, Bi-color angel, pecula clowns, royal gramma, coral beauty angel, yellow tail damsel, blue damsel, Sergeant Major Damsel. Misc. hermit crabs, snails, flame scallop, Xenia | 
