uvs

I recently set up my new tank and designed and built it to be as efficient as possible for removing nutrients.. Aside from siphoning and regular WCs, I'm incorporating a large UV and skimmer... I have an SSB in the tank and when its reached its limit for absorbing PO4 I'll remove and replace it...

Hello everyone. I just picked up a coralife 18 watt UVS for my 30 gallon reef per many suggestions. I had some questions about maintaining it. The factory bulbs are pretty expensive, $50+ for the 18 watt. What about the cheaper bulbs all over the internet some less than $20? Are they as...