It would probably even work better with this suggestion. You can even use the newer low energy bulbs at home depot. They have those in a really great 5500 or 6500k. I've read 5500k is the best for growing your refugium. === Also, and this is more just my curiosity than advise, can a fresh water swimming pool filter/pump even handle saltwater? What is it made of? Does it have copper parts? Will it leach? Will it corrode? I have no idea. Just throwing it out there for consideration.