New Tank - Single Overflow - Future Problems?

[Eric Woodliff]

I am looking into getting a 125 gallon at a really great, hard to pass up price. I’m still fairly new to reef tanks but I understand having a single overflow with no redundancy may not be a great idea. The new tank only has a single overflow, as pictured. Is there a way to convert this to a double with emergency or should I be ok with a single?

 

[Quietman]

Well it's not optimum that's for sure but if you design your sump right with total volume available to prevent overflow on power loss and a small enough return pump section to not overflow tank on drain line clog it can be safe. I would be happy and sleep well with that if I made sure and tested my sump on loss of power and if I shut the drain and tank didn't overflow. I would also make sure the return pump I used has low water level protection.

If you want a backup drain/overflow there are other options involving drilling or perhaps removing the current and going to HOB.