Sounds like bugs in the soil bro! Yellowing from the bottom up starting with tips, with cal-mag type deficiency. Your Roots aren't absorbing the required nutes. Next time you water, make a small puddle and look closely at the top. If there are small little worms that jump around those are spring tails, cheese fly larvae... look like house flys. They will EAT your roots if they can't eat what's in the soil, they will also over populate if there is consistent moisture. Fungus gnats look like mosquito's and there larvae are maggots, slow moving with a black capsule on the end which is there head. If you are giving them nutes every once in a while and its still going bottom up yellow with little dead spots, water.... look at the puddle closely and then dig a small chunk of soil out and look closely. If there is nothing then stop all chem nutes, water with plain water for the week and then try a dallop (big drop) of molasses per gallon. The molasses will give the cal-mag, i will usually add a tablespoon or so of epsom salts just in case. Remember LESS is MORE with auto's. You can also mix in cinnamon in the fist couple inches of top soil and then top off with perlite.
Occams's Razor says the most simple and obvious choice is usually right. An across board nute deficiency points towards nutrient uptake problems, meaning roots or PH. Since you have noticed critters before chances are they are chowing down on your roots.
Also do not feed a vegging plant a whole bunch, auto's can do MOST of it on there own.
