Since the tank is fairly new it's not taking much cleaning now, I did get a 25' garden hose and added a gravel cleaner to it, I took my house vacumn and was able to get suction, it worked great for draining . I like the idea of bubbles but how can I get something that would go to the bottom with a long cord I don't like cords showing. Is there's one I could get that would suspend from the top and blow down, there is a shelf at the top where are the cords are placed. Can you recommed a good source? Thank you for the info on the photo, I'll give that a try.