I am a newbie here and am in the finishing a feature that has an upper waterfall with an 8 foot diameter pond flowing into a 45 foot stream which empties into a 10 foot diameter pond. The whole system is about 1000 gals. The stream has a number of small water falls that add a lot of aeration and the water seems to be pretty clear but I have some what I assume is carpet algae forming on the rock surface, mainly in the ponds. I have not yet added any bacteria but plan on that as soon as I get it. I also have no fish yet but plan on a few gold fish. The only filtration I have is the filter mat in the Savio skimmer. The skimmer has the hole for the Uvinex light. My main question is if I really need the light since the water is clear right now, though it is getting colder lately. Will the light do anything for carpet algae? Is bacteria what I really need? Or should I use both?