the soil mix (medium) and the growing conditions (temps & humidity, plant size, etc...) will determine how often to water/feed.
if you're watering twice a day with a soil mix, then you are over-watering. that's why i originally asked what type of medium, you're growing in?
if the medium is more hydroponics-based (inert mediums like perlite, coco, rock-balls, etc, rather than soil mix), then this might be the watering/feeding cycle.
over-watering gives those symptoms you had photo'ed in the OP - the lower leaves browns/dies rapidly, while the upper newer leaves shows some damage at its tips. The leaves will start not been the healthy darker green, but yellowing around the edges, and even around the veins. The leaves gets 'bloated', rounder shaped. And the plant stagnates in its growth. Eventually, there might even be more insect/pest activity, and a smell - but that tends to be when its more extreme. It looks nutrient deficient because its roots system got fucked.
the typical suggestion is to dig 2 inches into the pot mix to see if its dried out, between watering/feeding - but if your soil mix is not quite right, then the bottom of the pot might be still moist, leading towards root rot/disease. that's why the suggestion here is to have the same pot size full of the same soil mix dry, and that pot with the plant growing in it - so you can compare directly the weight of these pots to determine how dry the plant is.
i also follow what was suggested above - just before it starts to wilt from under-watering, that's when to water. Out of these two sins - given the medium, temps, humidity, etc - its probably better to (slightly) underwater, than overwater.
the reason you start sowing in smaller pots, and gradually transplanting as it grows bigger in larger pots - from one side, its about root-bound, larger pots means bigger space to grow larger root system. But also, smaller pots with the smaller plant growing, is probably easier to water. If you have a large pot with a small plant, you only need to water around its stem, not the whole large pot. If you water a small plant in a small pot, you can't really 'over-water' the pot.
so, assuming it's soil mix - let the soil mix dry out, then regularly water according to a schedule (which might be 5 days or so between watering/feeding). expect more damage to become visible over the next couple of weeks, while it recovers. First, regulate its watering cycle before making amendments to it soil mix. Consider adding more perlite to this soil mix, which will again change that watering cycle/schedule. I think that the potting mix might need better aeration -less moisture retention, but hard to tell if it's overwatering.
if need be, made amendments to the soil mix - when it dries out totally, then consider repotting/replanting into a different/amended soil mix...
