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Nah, the problem was the various connection jerry-rigging I did to get the overflow output to convert to 5/8" tubing causing an air vaccum inside. I went back and got some 1.25" tubing and replaced the whole thing with it and it solved the problem; it was just very difficult to install because...

Finally got all the parts gathered and setup and did some testing with the overflow and the return pump and things seem to be running! I decided to mock a power failure to see how the system would respond and mark the "safety level" fill line in my sump and got that nailed down. The only issue...

I had to look up my filter after things @Aiken brought up and the Fluval 407 is indeed gravity fed. I'll probably pick up a Check Valve next time I go out; finding a fitting for the bulkhead was, for some reason, a massive PITA but I got it. I managed to completely snap off the part that hangs...

Ooooooooh. Ok, I completely missed/misunderstood that part! That would actually simplify the setup immsensely and I'd still get to use my glass inflow and outflow! I'll have to do some additional thinking but I think that would work just fine. Thank you!

I appreciate your diligence and input. I wasn't aware that the cannister filter is gravity fed, I always thought it provided suction... In that case, the first powst that included the overflow with the canister filter is ideal because I can prop the cannister up on something to be above the sump...

ooooooh. Yeah, haha, that would definitely be an issue... But wouldn't that also be an issue with the filter attached to the overflow? Should I move the filter placement to replace the return pump instead? Something like this?

I've attached my proposed setup and it got me thinking if I really need an overlfow? Forgive my naivete but shouldn't the cannister filter provide what I need from the Overflow box? And it shold prevent any reverse siphon issue should I lose power, correct, and then all I'll need to worry about...

Awesome, here are the pieces of equipment I'm looking at Overflow Box | EShipps PF-800 rated for 75-150g with max 800gph Return Pump | SICCE Syncra Silent 1.5, Submersible, Adjustable Flow Rate up to 357gph I have a bunch of spare clear hose line I was planning to replace the Fluval 407 hoses...

I hope you know how greatly I value all your input! I'm taking notes and really do appreciate it! Unfortunately that new link is a "Page Not Found" >.< The Bioload on the sump should be next to 0 if it's just substrate and plants, yes? Ok, so I need to look into the following Dedicated Return...

Hmmmm, I may have to do some thinking then. I'd rather not do the siphon route even though I don't think I've lost power in the 10 years I've been at my house but I also don't want to chance a flood... I did some looking and didn't realize overflows were so simple or readily available? Like...

Is this the correct link? It takes me to a shoe store.

Thank you so much for the info! I'll have to do some thinking because the siphon idea does not sound ideal. I don't think power has gone out in my house once in the 10 years I've been year but I really wouldn't want to chance a flood... I didn't know overflow boxes were so simple or easy. Could...

Thanks for the reply; I really do appeciate it! The 30g would go under my main tank in the display stand (like a normal sump would be). I don't mind drilling the 30g so that could be an option although I'd prefer not to (mostly because I wouldn't want to comporomise its structural integrity...

Hi all! So I recently decided to get back into fish keeping and picked up a 40g breeder aquarium. I have simple experience in freshwater (30g tank I had for a few years which is the spare in question) and also had a nano 5g saltwater reef aquarium at my office. I've never had a sump or refugium...