Say you have a canister filter that has plenty enough filtration for your tank, but you want more flow. Typically people would put a power head in the tank, but I'm trying to reduce the amount of equipment in the tank. So I was thinking, could I just add a pump like this: https://www.amazon.com/dp/B013JPL3Q2...ding=UTF8&th=1 to the outline of the filter? I don't see why not, but I figured I should ask the pros.

This would also be helpful because I'm going to have an inline reactor and inline heater so there's going to be a lot of line that will reduce the normal flow rate from the filter.

I see a couple issues,
1. that is a submersible pump, you would need an intake barb to put it inline. Some submersibles can be converted so check into them.
2. I think you would have issues with impeller on the canister motor having a higher GPH pump pulling on it on the output side.
May cause cavitation, noise, etc.
With that said ...i'm just guessing because I've never done it.

If you want higher flows, equipment out of the tank, etc. a sump is the best way to go.

If you really wanted to include a second pump, I'd put a Y on the inflow/outflow pipes (possibly replace them with larger diameter) and go in parallel. I don't think you will be able to push much more water though a canister filter even with a second pump, the resistance and fittings will be too limiting.

I haven't found much good info on co2 injected sumps. I've read you can seal them, but I don't know how much of a process that is, and how maintainable it is if you have to tape it to get a seal.

Bump: Great idea! Sounds simple enough too.

you can do a reactor for CO2 with a sump.

Y not adding another canister filter? Perhaps a smaller one. Can provide extra filtration and flow

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I have a sump and co2, I don't use much more co2 then when I was using a canister. At most I get a day or two less per tank and there are a few threads on this subject here and most people have noticed similar co2 usage from what I read.