06-27-2008, 08:49 AM
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it could work, but I think you really wouldnt be getting much benefit from the CO2. Sumps usually turn the water over way more often than regular filtration, and though I have just started with CO2 injection, it takes a lot of time, hours even, to get the CO2 saturation in the water where you want it even with heavy pressurized injection and absolutely no surface agitation. It might work, I dont know, I'm not trying to dash your plans; If I had to place money on it though, I would bet that you wont be able to get even close to the CO2 levels you are wanting. Also with the way you have it set up, CO2 generally isnt going to get into the water properly without some kind of reactor, so a slight adjustment would be to split the return and use an inline reactor. Also, I would not inject air if I was doing CO2 except maybe on a timer at night starting a couple hours after I turned off the lights till a couple hours before they turned back on.
An alternative option would be to use one of the liquid products that put in available carbon.
I think your plants will do A-OK without CO2 really, surface agitation will get CO2 out of the water, but I would think only to the point where it equalizes with the air above the water. Trees and whatnot do fine with the amount of CO2 in the air so your plants should too, maybe just grow a bit slower, and an occaisional dose of flourish can give them a jump start.
Since you're going plants and a sump, have you considered a freshwater refugium? I think that would be a really neat idea.