its not hard to put a light in it and choke the flow down. all you have to do is pull the impeller out and cut a blade or two off, and they have robot LED lights that clip on to the sides of tanks that you and use. chaeto is a great form of natural filtration used to suck the nutrience out of the water, LR is used to break ammonia into nitrite then to nitrate. they are used for two different things