Sump Ideas

[blacknife]

i have never had one but i believe those HOB overflows will not over siphon the tank. the part in the tank is a small overflow box and when the water is to low no more will drain. some use a qualifier pump to regain the siphon if that low water condition breaks the siphon.

drill bits are cheap it would be easy to find a non drilled .. or even already drilled tank. diy it to the specs you need, and then move everything over.

or depending on what you have going on for a tank just put everything in a rubbermaid holding container, do the work to your tank, rebuild everything, get it running then move the livestock over when everything is kosher.

if the available ones are to expensive you could probably diy one that is just as functional for fairly cheap if you are at all crafty and can do a good google search.

[untamed]

I used a CPR overflow for 10+ years on my old tank. It worked reliably. A pump is used to pull any stray air out of the top of the siphon. If air would be allowed to accumulate in the siphon, it would stop...which would be VERY bad.

That is the only job of the pump. The pump is not there to restart the siphon following a power failure. The siphon will always restart automatically as long as there is no air in the siphon.

[Bblinks]

I had a CPR overflow for a year or so, it really served its purpose, but I wouldn't want to use it again since there was a couple of time I woke up thinking it was raining but instead it was my tank over over flowing onto my face. If you are interested check out this website, super realiable and it will not cause a swimming pool in your place. http://www.lifereef.com/
Extremely well built.