Quite a few options but first you have to decide if you object to seeing bubbles (mist) in the display?
Using a large reactor should give you a mist free tank but a very simple and cheap method is to feed the C02 directly Into the sump return pump.
Mine’s not big (80l + 30l sump) but I use a NEO diffuser in tank with a 5kg extinguisher by the return pipe so it blows it all around the tank. George Farmer is a strong believer that the bubbles in tank are of benefit to the plants too so I’ve been following that advice for some time with success in both my other tanks. With a sump I think it makes even more sense as the plants can at least have a good chance of the bubbles sticking.
My checker is always a good colour too.
I’m sure there is some loss, but I think with the choice of a sump we have to accept that regardless. I must admit the loss is no where near as bad as people made me believe though in my opinion.
Many other ways and I’m sure others will chip in but that’s just what I’m doing