Drilled or External Overflow?

[Bob]

I have had external overflow for almost 20 years...
The new ones are self priming...so if power go's off..they start atuomatically...
If this is your first tank...you will be moving up...usually a few times...this is where the external one pays for itself...I have seen a couple on here recently...one for 80 the other a 100.
They do not over syphon..overflow your tank...they work almost the same as a built in one....I speak from owning both....I still have my external one

[Aquattro]

Originally Posted by Bob

...I have seen a couple on here recently...one for 80 the other a 100.

Another one (CPR) for 65...

[Reefpins10]

I just ordered an overflow box from Lifereef after I read this useful advise for not using a reefready tank.

http://www.aquacorals.com/ShopAquariums.htm

[trilinearmipmap]

I have never used a hang-on overflow but if I did, I'd get a lifereef, and also add a float switch so my controller would turn off the return pump in the event of a siphon break.