Hello my friend
1st off, your plant looks healthy which is very nice
What I would change is at that size it doesn't need a lot of water so 4/5 day's should be fine because your LED won't produce much heat which would dry your soil. Always water to runoff so your roots never have to search for water.
Also bring your light down to 14". it will not hurt your plant.
If your a serious grower and plan on doing it for awhile go buy a TDS/PPM/EC meter which really is important to know exactly the amount of nutes you are using. The instructions on the bottle are approximations and really aren't accurate enough to be sure your giving it the right amount.
Seeing as your using soil with nutes, I would use around 500 ppm for a start and then if you have no issues like burning. which you won't, bump it up to around 700/800 when you get to bloom.
Pot plants are fine from high 70's up to 90 degrees max with a fan. 80 is perfect for max growth.
Maintain Ph from 6.8-7.2 with 7.0 being foolproof
Humidity from 60% to 70% is fine and always use a fan to give the plant a breeze.
Indica's are a squat plant which should work ok in your tent, but your cutting it very close.
I would recommend 4' minimum and 3 gallon pots are perfect for a 8 week-10 week plant. Use that next time.
Good luck & I wish you lb's & lb's of crystal bud that look like sno-cones.
Have fun