I use an air hose sized hose and a little syphon pump into a bucket. The smaller hose gently sucks up the debris from the bottom and around plants without disturbing the plants or sucking up my shrimp!! To refill, I use a 2.5 gal spring water bottle with a tap, like you get at the grocery stores, and pull the tap out just a bit so it slowly and gently lets the water into the tank. Works fairly well. I can even set the water bottle on top and walk away while it's refilling the tank!! I'm sure I'll want to change some of that once I can upgrade to a larger tank, but for now it works for me.