Too much flow restriction on a 2213?
20H running an Eheim 2213...
Built a PVC CO2 reactor, Griggs style, that sits inside the stand, with the output of filter going to the top input of the reactor, output of reactor to the spray bar. (so the Eheim is lifting about 3.5 feet to the rim of tank)
Been wanting to get my heater out of the tank for a while, and was thinking of putting a DIY inline heater on the return of the reactor, or possibly on the siphon side of the filter.
You think this is going to restrict the flow too much on the 2213? or should I do it as a separate siphon/return on it's own small pump, sizing the pump to get enough flow. (One benefit would be I could turn it into a water polisher as well). Trying to keep as much as possible inside the stand, not visible in-tank, so I want to avoid a powerhead in the tank (a small siphon tube with a piece of sponge I could hide easier).