Blacking new bulbo growths

[sunfire]

Ah! I am upset. This new growth was doing really well but now it is turning black (must be in last 2-3 days). There’s another small growth in the back that has a similar appearance. Fungus? Advice? Should I remove it?

This is potted in long fiber sphagnum moss with LECA on the bottom and sitting in a few millimeters of water. It is inside in a garage under grow lights getting about 800-1000 foot candles. The temperature is around 80F with humidity around 50% (was higher a few days ago because of the rain). I had it under a vented plastic humidity dome as well. It is watered with RO (TDS 5) and fertilized with MSU RO fertilizer at 25–50 ppm N. The last watering I used to Kelpak and quantum total.

All advice appreciated. Thank you.

[SADE2020]

The point and bottom are green. Is hard to see, if is only the sheet getting dark ..hope is a false alarm

[estación seca]

It's not wet enough. New growths blackening and dying is classic for an underwatered Bulbo. It's not fungus.

The older leaves look wrinkled and dehydrated. That confirms underwatering. Most Bulbos are wet growers.

The LECA isn't wicking enough water to the moss. Figure out how best to keep the moss wet.

Bulbos have very short roots. If you want to stand a container in water, consider using a much shallower container with only sphagnum. It doesn't need to be deeper than an inch or two. Rectangular plastic food trays work well.

[sunfire]

Thank you. Yes, I received this bulbo dry root and wrinkled. It has pumped up a bit. I am just surprised because the new growth was growing fast and bright green until just recently. I thought it was doing great! I used the humidity dome to increase the humidity around the plant as well. Usually I keep the moss essentially sopping wet watering both above and below.

I guess it is possible that the roots have rotted and that is why the new growth has turned black from dehydration? My instinct is to unpot it to inspect and maybe cut off this blackening growth. Does that sound reasonable? Or should I just leave it alone and make sure it stays wet (although I don’t know how much more wet I can keep it tbh).

Originally Posted by estación seca

It's not wet enough. New growths blackening and dying is classic for an underwatered Bulbo. It's not fungus.

The older leaves look wrinkled and dehydrated. That confirms underwatering. Most Bulbos are wet growers.

The LECA isn't wicking enough water to the moss. Figure out how best to keep the moss wet.

Bulbos have very short roots. If you want to stand a container in water, consider using a much shallower container with only sphagnum. It doesn't need to be deeper than an inch or two. Rectangular plastic food trays work well.

[estación seca]

I would not cut it off. It's unlikely the roots rotted.