Hi snowdude, I have a 30g XH. Its connected via sump to my 36g LPS tank. The 9.5 mag drive pump is split between the 2 tanks but runs thru a UV before the return goes into the pony tank so probably 300gph. It also has a prizm pro skimmer, and an in tank whisper with rubble rock(for safe haven for pods)and filter floss. It also help creates surface agitation which is important in a seahorse tank. Lastly it has 2 little Rio 90pumps down near the sand to keep food and particles in suspension to help with water quality. Finally I am utilizing a lot of macro algae and soft coral to take up nitrates and phosphates. This tank is for 2 captive bred erectus seahorses and 2 captive bred banded pipefish. No other inhabitants except snails and peppermint shrimp. I hope that helps.
PS. I have a Coral life 4 bulb T5 fixture. Right now it has the stock bulbs but will replace with 1 actinic, 1 purple, 1 10k and 1 coral daylight just because I like the color and I think the macros will be fine with that.