Phal leaf retention and Yellowing leaves

[YokaYampi]

Hello!
My orchid collection like many others started with phals, i grow them under LED lights on a shelf in my bedroom. That is until the orchid bug bit me a littler harder and i got a small 2x4x5 grow tent. It's fully operational with Wifi timers and triggers for temp, humidity and light.
The issue im having is that i cant seem to retain a large number of leaves on some of my orchids. They grow, they bloom but they arent gaining leaves. They'll loose for every one they grow. instead of growing lets say 2 and loosing 1, this is making it so theres no retention of leaves.
A Tetraspis C1 started getting lighter color on the edges of the leaves so i thought it might be a magnesium deficiency. So i gave it a little magnesium.
The other orchid im worried about if the Tetraspis x livida who's has very nice green leaves up until a little bit ago where the hue has turned from that nice deeper green so a lighter yellowy color

i normally fertilize weakly weekly with an msu
Could it be too much light? not enough light? or a virus maybe?
here are pictures of both orchids


honestly this issue is really frustrating, any insight would be wonderful!