Most people now-a-days don't use wet/dry filters in the saltwater hobby. Although there are people who still do use them, there are better, more effecient ways of keeping your water/tank clean.

A good protein skimmer and a good amount of cured live rock and keep your tank alive and happy. If you end up incorporating a sump with a fuge attached, this will help your water quality even more. The fuge (refugium) will allow a safe haven for pods to grow and will give a home for macro algea to grow.

When using a wet/dry, make sure you replace the filter floss weekly. Alowing this to slip over time will allow more detritus to build up, helping your nitrates to rise. They say the bioballs can trap detritus as well. You can ditch the bio balls and replace that with live rock rubble.