Are my bta's dying?
 

I have a 14 gal nanocube deluxe. With 2 clowns, 2 baby bta's, 5" bta, and hermits. Lighting is stock. Levels are great and I just did a 20% water change 2 days ago. I'm a newb but the tank has been running for two years. I have had the big bta for 1 1/2 months now and it was thriving. About 5 days ago the 2 tiny bta's closed up completely. The large bta has reduced in size by 3/4. It has thined out ALOT and closed up almost completely. It is not letting the clowns host at all and has moved out of the light. A week ago my cleaner shrimp also died for no reason. How do I deal with this with my tank not taking a beating? When lookin at the attached picture please keep in mind the clowns are babies and the bta was EASILY 5 inches across. Now its less then 2. Are they dying? If so what do I do? PLEASE HELP

They look completely bleached. I don't think BTAs should be white.

What exactly is your light?

Its whatever comes with the nano cube. But its the deluxe on so its supposed to be improved. the dude at the store said it was fine....but one thing i learned is they dont always tell you the best things

When it was healthy and out, it was pretty much the same colour. sorta opaque and see through...mostly while, skin colour near the base

What are the water parameters?