Friends who understand hydro, help with advice!

No diary, no possible way to come to any conclusion, Already told you the mechanisms at play that might be able to lead you yourself to make a decision based on your experience. But without metrics and history to see where you went wrong all anyone is doing is guessing visual symptoms, Example: "OH look your leg fell off" "Just add a leg" "Oh look interveinal chlorosis indicates magnesium deficiency." "Just add magnesium" No point in sticking a leg back on if your just going to blow it back off in a week, no point fertilizing with more salts until you can identify root cause or you risk exasperating the problem. Try a foliar application of magnesium in early morning 30 min before light on if you have, this is fastest way to absorb nutrients into leaf and bypass rootzone uptake.