troybernard;3659736; said:
for a fish room, what would you recommend for a central filter set up?
First, keep a sponge or two in each tank in case you have to take a tank "offline." Also, the are great grazing sites for fry. So you'd need a good sized air pump to run all the sponges. I purchased my last couple of large air pumps from
www.Jehmco.com and they worked great.
Next, drill all the tanks for drains so you can use a central wet/dry filter. For a sump it would be easy to use a Rubbermade horse trough. The bigger the better, but a 150 gallon trough would be the minimum. They make a 300, but it's footprint is huge. You could definitely connect two 150's if necessary (they come already fitted with bulkheads).
Basically, you'd have a huge container of bioballs (a plastic garbage can or two) as your biofilter. Water would be drained into the sump, preferrably into a prefilter sock. Then a medium sized pump would circulate it over the biomedia (a submersible would be fine). A very large return pump would be used to return water to all the tanks. Of course you could arrange for just one pump to be used if the drain lines fed directly into the top of the biomedia. However, than can be difficult in most large setups since the bio-tower would be so high.
As for heating, it could all be done in the main sump. Also, water changes could come out of the sump rather than the tanks.
Honestly, the guys at Jehmco can talk you through it all AND sell you everything you need. I'm not affiliated with them, but I have been a customer for about ten years now.