My bottom drilled 75 has a 1/2 pvc up to the top. I can't imagine they'd put the return under water.
My understanding is 4 returns will come up from the bottom, then they will be all tied together under the tank with check valve, still makes me a bit uneasy, if that check valve were to fail, 200+ gallons of water on the floor.if the return is under the water line by more then a few inches then you need a check valve. better safe then sorry with a huge mess to clean up. tank water is no bueno on the carpet. I know from experience.
Not sure, but most people on reef boards have tanks from them.sounds like they don't know what they're doing
Fishstix - do you have room on top of the tank for a small surge tank? I you have the top framed all the way to the ceiling then its possible to put a 10-20 gal surge tank. This is a better way to return high rates of flow to your tank in a fail-safe manner. I will post some drawings if you want.
Thanks for the reply, at this point, and reading a lot, these guys might put returns in all the time on bottom, just scares me to much. I think I am going to go with returns in the overflow box. I think that the best way forward.If it were me, I wouldn't want any holes in the bottom of a tank (especially a large tank) unless it was in the overflow box. It's just too much of a risk if you ever had a leak. As an added bonus, a leak back there could be a PITA to access at all. Could they drill the holes through the back glass? Just have plumbing up the back of the tank and a 90degree elbow in through the back glass?
Or going up through the overflow box like you have listed. Although you also may not want to have a whole series of holes in the bottom of a tank with the water pressure on it. The bottom giving out on a 210 would not be a fun time. Just some things to think about.
Why are you looking for 4 returns? Is that easier or somehow more efficient than having one or two return lines coming up and having it split once it is back into the tank?
So they run to top of tank? Do you run sump and pictures? They told me it would need it own pump closed loop.I wouldn't worry at all about the holes in the bottom. My 75 has one 1.5 and three 1/2 bulkheads in the bottom. The pipes just come up to the surface from the bottom. My 90 is also bottom drilled but has the acrylic around it for the overflow. Needless worrying imo
I've got a 1.5" and a 1/2" bulkhead on the bottom. Respective pipe runs to the top of the tank. I added a 3" adapter on the overflow after seeing it on some runs at a LFS. Right now I am only running HOBs on it. It's in my fish house. The sump I have for it is huge and I don't care for it. I've got another sump on a 22 breeder that I may transfer over. As it stands right now there is a piece of flex pvc sitting in the 40B below the 75from the overflow. The input side has a piece of 1/2" pvc that is right above the 40B. I had the sump running for a while then just disconnected it and left the pipe and tubing. When I do a WC I just let it overflow right into the 40B since it has plants in it. Hell the 3" adapter isn't even glued on and the connection is below water level with no leaks.So they run to top of tank? Do you run sump and pictures? They told me it would need it own pump closed loop.
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