Wet/dry's are typically needed on FO
tanks that either don't have LR
or don't have enough to handle the biological filtration. The bio balls will convert the ammonia/nitrite to nitrate and release it into the water. The LR
(didn't know if you set it up with a DSB
) will convert the ammonia/nitrite to nitrate and the nitrate to nitrogen gas. Take all the media out of the wet/dry and use it as a sump. You should have enough LR
for a light bio load. If you intend to heavily stock the tank, I'd add another 75lbs or so. The best thing would be to add more LR
and keep a light bio load...it will be lots easier to keep water quality up.