Hi! My boyfriend and I recently started a tank and we currently have a 20 gallon tall tank with a aqueon 30 filter. Our fish are a 2.5in fancy goldfish and a 2in chinese algae eater. The per store sold us both and said it would be fine but after some research and noticing some nasty behavior from our algae eater we realize we made a mistake trusting the store. Todd, the algae eater, is trying to suck the life out of our goldfish. We have temporarily separated them and have a 6.5 gallon tank with a 10 gallon filter on standby. However, we are attached to both fish and are willing to even keep them separately. So my question is how can we set up an environment for Todd with any other fish? What's the best solution?