Man, that's some nice renovating. I don't think I would have the confidence to even buy something like that to clean up.
A note on your reactor, I hate to be the bearer of bad news, but the Ista doesn't feel that much better built. I've always had it INSIDE my tank because I feared a leak or something. I had a medium sized one I believe. On upgrading, I was tempted to go with the Sera because it 'looked' better built and larger, but now you've confirmed different.
If you're up for it, I recommend building your own cerges or griggs type. Sure, you gotta go through the trouble of figuring out the fittings that you need, but it'll be able to dissolve much more CO2. The size of a cerges would be limited to what water filters you can find, and the griggs would be ... well, any size you want your PVC to be. You'd actually have to resist building one that's too big! Also, if you value your silence, I suspect maybe a griggs might be better.
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