they look pretty haggard dude, especially for 1.5 months old - you should have started flowering by now. But theyrenot big enough yet. Hmmmm....i mean, now you say you have shit under control with the temps and conditions right?? 75-80 degrees with like 30% humidity is a good place to be for growing. N as far as your soil goes, get FOX FARM OCEAN FOREST ORGANIC POTTING SOIL - its basically soil meant for cannabis, lol. Has everything your plant is gonna need in it for the next couple weeks, but not a full month because your plants are semi(SEMI) mature. What your gonna wanna do, is transplant those fuckers ASAP, watering them into your soil as delicately as possible. Use ALMOST a half a gallon when watering your plant into its new 2-3 gallon pot, and then wait for it to dry out ALMOST COMPLETELY before you water again. Itll perk up - youll see. After a week n a half (basically 3 or 4 waterings) of using just PH BALANCED WATER, use your nutrients (FOX FARM PREFFERRED). if you can get FF nutes, get them bitches man. they are worth it. order them online if you have to. Get Grow Big, Big Bloom, and Tiger Bloom.
In your first watering with nutes for this case, your gonna want to use 2 tsp of GrowBig, and 2 TBLSP of Big bloom per gallon (PER GALLON) of water that you mix up. Water them with almost a half a gallon per pot, like before, or until you get a nice runoff from the drain holes. By now your plants should be healing. If you want the Fox Farm Feeding Schedule, hit me up, i have it on PDF, if you decide to get the FF nutes. Sorry if i sound preachy man, believe me i dont mean to be, i just wanna see your plants live, and doin what your doin now aint gonna cut it, n since your askin for recommendations, the Fox Farm line of soils and nutes are quality, and All Organic Based, and IDEAL for beginners because its so hard to burn your plants with their nutes. Let me know what you end up deciding to do man, i wanna see if you can make these babies pull through