When to start using nutrients?

I don't think happy frog is too hot. You see the hint of paling starting at the bottom, start with 1/4 strength every other then observe and adjust from there. the more you use the same product the better you'll pre-empt any deficiencies. leaves look a bit wrinkled, and if light isn't playing tricks a bit blotchy in color instead of a solid green. the light green new growth could be a deficency or a bit too much P or K, it's just a guess what came in the soil. This could be the plant (odd genetics) or the ratio of nutes in the soil / environment. not a fan of fox farm nutes. i think the ratio in the substrate is not working out for this plant. might be reason for a little fertigation to adjust that ratio and balance out some excess.