I have a 120 gallon tank with 6 piranha. The filter thats on it is a Aquatop cf500 with the built in uv light. I have sand as the substrate and im planning on changing it to gravel this weekend. When i bought the tank it came with a under gravel filter but since I as planning on using sand i didnt use it. Would it be worth my time to set it up when I take out the sand this weekend? Not as a replacement filter but just as a second one. I have the marineland maxi jet 1200 powerhead that i can think will work for the undergravel filter but im not sure how to set it up. ive never used an under gravel filter so i dont know much about them. Do i have to clean under them?
