I am using an eheim ecco 2236 on a 55 gallon tank right now. I would like to get two smaller tanks and I'm wondering if there was anything I could use to split the tubing so that I could run the filter for the two smaller tanks?
Yes, you would need to arrange for the water from one tank to flow into the other... you could use a simple bridge, if the two tanks are the same height AND on the same level. (or drill both and join !)
Or drill one tank, and use an overflow into one underneath.
Do you really need 2 tanks ? could you not use one with a divider ?