It sounds like the lights just uncovered a problem that was already there. You don't have to use a phosban reactor, you can filter sock it. I used it before I bought a phosphate kit, only to find out I didn't have a phosphate problem to begin with. Just keep up with your water changes. 10% weekly is easy. I usually do 15-20g per week and 35-40 per month. Just taking that extra time to do a slightly larger water change should help out dramatically. Also, if you have mechanical filtration (pads) in your wet/dry, clean it, along with about 1/2 to 3/4 of your bioballs, depending on how much live rock you have. I say that as not to shock the system if you remove and clean too much at once, but if you have enough LR, you should be fine.