White patch is getting sparse

More bad news and then some. #2 as predicted two days ago collapsed. #9 shriveled and also is dead. This leaves three surviving seedlings: #4, #8 and #15.

#4 appears doing fine. #8 (the one under a plastic cup) started showing some irregularities in the green needles marked with arrows in the picture below.

A narrowing near needle tips also appear to have a slightly darker color than the rest of the green. I have added just a few drops of water yesterday to this sample. The plastic cup placed on top of the tube remained foggy with water vapors. For now I am keeping the cover.