1. You are currently not using that much 2 part, relative to your water volume. You could easily get away with a 612 (which is what I have) for awhile. If you have lots of SPS that will grow out, or become SPS heavy, a 618 would be better. If you have room in your sump, or a fish room, I would go with a 618 anyways, just so you don't need to refill the canister as often. Refilling is a pain in the butt, with those thumb screws and leak risk, etc. The 618 is just taller.
I bought a secondary chamber but have not set it up yet. My pH seems fine without it. It is supposed to supersaturate the alkalinity and raise the pH of the effluent a bit. If you have room for it, definitely get a secondary chamber.
2. It comes with recirc. The feed pump is a big debate where most of us are gonna suggest the masterflex or similar pump for best results.
3. I think it's good enough but it's easy and cheap to install additional if you want.
4. Up to you if you want to give up your pH or ORP slot. I think it's good to know tank pH and carx pH. I also liked having ORP, so I got the PM1 module. I think it's good to have it connected to apex because you're gonna control the co2 tank solenoid to energy bar to shut off if your carx pH drops too low (emergency) or to actually control the pH in your Carx.
5. Up to you.
6. 5 is too small, I think. But really depends on space. I can barely fit a 10lb in my stand. If you can fit bigger, go bigger imo. I haven't refilled my tank yet, but I will probably buy a backup 10lb eventually.
7. Not sure what is included with the geo (got mine from @Newjack). But there is a valve to control the co2 rate, and if you use a masterflex you won't need another needle valve.
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I bought a secondary chamber but have not set it up yet. My pH seems fine without it. It is supposed to supersaturate the alkalinity and raise the pH of the effluent a bit. If you have room for it, definitely get a secondary chamber.
2. It comes with recirc. The feed pump is a big debate where most of us are gonna suggest the masterflex or similar pump for best results.
3. I think it's good enough but it's easy and cheap to install additional if you want.
4. Up to you if you want to give up your pH or ORP slot. I think it's good to know tank pH and carx pH. I also liked having ORP, so I got the PM1 module. I think it's good to have it connected to apex because you're gonna control the co2 tank solenoid to energy bar to shut off if your carx pH drops too low (emergency) or to actually control the pH in your Carx.
5. Up to you.
6. 5 is too small, I think. But really depends on space. I can barely fit a 10lb in my stand. If you can fit bigger, go bigger imo. I haven't refilled my tank yet, but I will probably buy a backup 10lb eventually.
7. Not sure what is included with the geo (got mine from @Newjack). But there is a valve to control the co2 rate, and if you use a masterflex you won't need another needle valve.
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