Hello, I have an overstocked 10 gallon tank and I need suggestions on good filters because the current one is meant for 10-20 gallons but it isn't good enough. I plan on upgrading my tank to a bigger one soon but until then I need a good filter for my tank that isn't stupid expensive and I also want to mention what creatures I think are in the tank: 2 baby crabs, 1 ghost shrimp, and a few snails. You might be thinking that that is not overcrowded there are not many creatures, you would be right unless I told you that 1.5 gallons of my tank is sand and not water and under that sand lays many creatures, every week a new one emerges. I had a recent ammonia spike and it killed one of my crabs but then less than a day later one of a similar size took it's place, this tank used to hold about 12 ghost shrimp, all of them died to a disease/parasite. A ghost shrimp emerged from the sand. Over the course of the months I have had this tank I have added so many creatures that have died or disappeared and more creatures emerge from the sand then I remember adding. I suspect that at least 15 other creatures live under the sand at this very moment. That is why it is overcrowded and I need a good filter, I need it worlds better than this aqua tech power filter 10-20 that uses ez change #2.