Yellow tips on most leaves. 1 gallon yesterday, no...

A couple of slightly burned tips is very common to every grower. Especially with strong LEDs, I dare to state that it happens during pretty much every grow, sooner or later. It's not something that indicates a necessity for a substantial adjustment, however, it is an indication that you're close to burning the plants due extensive light or due to overfeeding. Looking at your pictures, I think it's more likely to be a bit of lightburn. Raising the light a bit, is a good idea, but don't raise it too much if everything else is fine, just an inch or 2. Keep an eye out and if the symptons don't get worse, than all is fine.