I have a problem! Please help.

[Rogue951]

If designed properly then there's little chance for severe disaster.
my system has enough room incase either the return pump or overflow fails that either tank (sump or display) can handle the excess from the other.
as for the aqualifter failing one day, if you keep both ends of the tube underwater and check on the pump once in a while, even if the pump fails, having both pipes submerged will prevent a break in siphon.


And both box overflow and drilled overflow are used to feed a sump so not quite sure what you mean when you say an overflow box is more likely to screw up than a sump. Yes, a bulkhead is cheaper but sometimes that just isn't an option for people.

Originally Posted by Funky_Fish14

Sorry to jump in with this but... IMO stay far away from hang on overflows. I know many people use them all the time with success... but the chance of a screw-up with them is about a million times more likely than with a sump... If they fail... your sump will effectively be emptied on to your floor (via your main tank). Its cheaper to get a hole put in and use the right plumbing than it is to use a much more risky hang on overflow. Just my 2 cents.

Cheers,

Chris