Overflow box, or new tank bottom

[Chernobyl]

So i have a 125 gallon tank that im going to use for my reef tank. It is not drilled.
For 150 i can get a huge CPR hang on overflow box.
For 160, i can get a new bottom panel for my tank, pre-drilled.

What do i do, and how much of a PITA is it to replace a bottom panel if i go that route? Will I have to re-silicone the sides?

[kimber45]

you would have to completely re-silicone the whole tank i believe. silicone doesn't bond right with cured silicone.

how about something like the glass-holes 1500 gph kit?

[billdogg]

I assume the bottom is tempered? If it is, how about drill the back? replacing a piece of glass requires a COMPLETE disassembly, cleaning and reassembly. Although it can be done, it will be a MAJOR PIA.

I am not a fan of hang on overflows. It is way too easy to drill in the spot of your choice. Also - remember to use a larger bulkhead than you might think you need - you will never regret having more drain capacity than pump output!

[Chernobyl]

I know the bottom is tempered, there is a "no drill" sticker there. What are the chances the sides are too? Whats the easiest way to tell?

[nanonubey]

Call the manufacturer, they'll tell you.

[TAB]

If you have to go the overflow route, you want a livereef overflow.