I currently have a 75 gallon community tank that well stocked with. Tetras, Dwarf Gouramis, Platys, Guppies, Cory Catfish etc. For filtration I have an Eheim 2215 rated at 164 gph which I'm aware is not enough filtration for that tank. I'm shopping for a new filter to add to the tank. What would be a good option? I'm torn between the Aquaclear 70 ($40) and the Aquaclear 110 ($80). Would the Aquaclear 70 be enough? I'm thinking of using the AC70 for mostly Mechanical filtration and the Eheim for mostly Biological filtration since the 70 moves more water.