Originally Posted by mncspradlin
Upgrading to 125 gal
reef tank. Here's our questions:
1. How big a sump/fuge do we need (I know to remove the bioballs)
2. How big a return pump can we have?
3. How do we keep from having 5 powerheads in our tank to maintain appropriate flow rates?
The tank will come with 2 corner overflow boxes built in.. What else will we need. Already have the lights and skimmer...
Alot of good advice so far on pumps..back to the rest:
1. As large as possible. If doing under the tank sump you will be limited by what will fit in the stand. Make sure the sump is in place before you set up the tank as with many stands it is difficult to get a sump in the stand once set up. BTW, check out a DIY style sump as opposed to a purchased one. You get what you want at about a 1/3 of the cost. A 55g would make a nice sump/fuge and fit under most 125g stands. Otherwise it does not have to be anything fancy if going for just a sump, rubbemaid tubes can work well. I say as large as possible because the more volume you have the easier the system can be to maintian without getting to crazy.
Here is the link I used to build my 30g sump/fuge:
2. Pretty well covered. I do like the redundancy issue as well especially if you have 2 returns. That way if one pump fails you are still in business. Again, remember that overall GPH
minus height should not exceed overflow capacity GPH
(with 2 overflows I doubt you can find a single pump that will).
3. Instead of PHs take a look at a closed loop system. I am looking into one right now myself. You can do this by drilling the tank and pumbing an additional pump with as many out puts as you feel you need. I have also seen this done as a HOB
system with PVC
where there is one inlet and 2-4 outlets run by one pump.