So, assuming you have good surface agitation and you're not relying on the plants producing the valuable dissolved oxygen for your fish during the photo period, your co2 levels are probably balancing out nicely every day anyway. As such, reduced or not reduced co2 probably won't matter much. I don't bother. One less thing/timer to fiddle with.
The light, this matters. Its the driver, the gas pedal, the pusher, etc. I'd go 4 hours especially for your longer period away. Slower growth lets your nutrients get used up slower. That's really the reason behind it. You can't have no photosynthesizing and if you photosynthesized so much that you ran out if nutrients, you'll run into algae issues. So that's the fine line to guess on. If you had an autodoser we probably wouldn't be having this conversation, right?
Maintenance before and full weeks dose could work too. And here would be where I count on the "fattening up" of the plants or loading up the substrate to carry over the second week. Probably silly things I think that might matter a little in my head. On maintenance, I'm the lazier type but then again, I have smaller fish. A skipped maintenance does not matter so much for me. I can see with bigger fish, you may want to start with a cleaner slate so that's probably ok if you're comfortable with it.
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