Repotted phals, need help with root rot :(

[Purple_phal_gal13]

Hi ya'll. Well I've repotted some phals that really needed it. One is my little Phal. equistris(?) and the other is my Harlequin which ain't doing so hot at all and is still recovering from crown or root rot.

The mini phal had some new root growth going on and it was pretty pot cramped. It was still in a little, "plastic" pot liner thing and I moved it into an Oxygen Core pot with a sphag, perilite, lava rock, and I think coconut husk. I did very little trimming of the roots as it was looking really good.

Now for the worrisome one. My Harlequin, a while ago I repotted it back into it's old pot which was way too large for the root ball that was left. And I used a Miracle Grow Soil-less potting mix. It survived and has produced two little leaves and one small root. Now that I'm much more knowledgeable I've repotted it.

I noticed while I was removing it from it's pot, the other side has a very small root node. I know it's real late to be repotting but it hasn't grown at all and the remaining bigger leaves have started turning yellowish. I also planted it in a similar mix as my mini phal.

Ok, the two concerns. One, the pot for my Harlequin is again a little large (3") but it's all I had and I was afraid to wait any longer.

Two, since this guy is in rough shape and the mini has been repotted, I'm keeping them in a small beta tank (no chems been used) with some water in the bottom to promote humidity.

Should I keep these guys in the dark or will they be fine with some light? I've heard varying opinions on this and I want these little guys to survive. I'm like a nervous parent and I dont know what to do. I know air circulation is important. I plan on giving a dose of Physan 20 as a preventative.

What should I do? I'm desperately wanting these two to survive as I've problems in the past.

Any help will be much appreciated. Pics will be posted tomorrow since compy not cooperating today.