Fertilizer question

[Rusty Trichome]

I agree with purplekush989, although I'd watch for yellow lower leaves as a sign to start hitting them LIGHTLY. Some say to start after first real set of leaves too so hey, maybe test it on one and observe. Since the soil has nutes it may be better to lean toward safety. Perhaps MG All Purpose @ .5 tsp (the little end of the spoon) to 1 gal and see how they do before upping in in a week or two. If you were to go 1 Tbs like for "outdoor plants" it could be a severe over dose of nutes. 2.0 or 2.5 tsp to a gal once a week would be way later about the max before switching to MG Bloom Booster when you switch the lights/times to flower.

When I was into MG All Purpose, I was giving it at 1 tsp:gallon of properly ph'd water. Indoors, with a heavy soil like yours, doubtful you should add nutes for a month or so. The plants will tell you when.

Flush once a week is good.

Wrong. Once a month is ok. Once a week and you'll keep the soil too saturated.

Nute once a week is good, some half dose twice a week.

Yup.

Some B-1 vitamin from home depot is good. Super-thrive is crazy shit, I'd get some.

I wouldn't. Both are garbage. B-1 and Vitamin Stimulant Myths

3 plants in one pot is usually not best. YMMV

One plant, one pot. Unless you are planting three to pick the one winner to keep.