bmwarron, I'd actually NOT put seahorses in a reef tank
refugium. I wanted to address that in this related thread and your inquiry has helped me get to that point...
If you keep a reef tank, chances are your water temperatures are in and around 80 degrees F. That is far too warm for seahorses. Not that they are not found in waters that warm, but in captivity, we tend to keep the water coolere, and therefore fend off the various bacterial diseases that can explode in warmer water and wipe out sensitive seahorses. The proper temperatures should be in and around 75F.
Seahorse systems, and related
sumps and
refugium should really be dedicated to the seahorses themselves.
Weberian.. I use a
wet/dry vac to suck the sludge out of my
sump and sandless
fuges when I do water changes. Just shut off the return pump, let the
sump fill to the "high water line" and mark it with a crayon. Suck the various
sump chambers clean with a wet dry vac and then refill your water change water to the level marked on the
sump. Turn on the pump again and done!