I would put the tigrinum in a smaller pot or place some styrofoam pieces in the pot so it dries fast. Tigrinums seem to like a very quick wet / dry cycle.
The niveum, If you have been keeping it less than 18 or 20C it is probably asleep. I would just try to hold it steady until it starts to move before trying to feed it or whatever.
If the roots are OK, then I'd use regular dilute complete fertilizer with intermittent 'seaweed'. That should take care of any 'deficiencies'.
What are you feeding them, Isabelle?
try mixing back in 50% tapwater instead of the RO. The plants look OK overall.
Isa, about 150 ppm: are you talking about nitrogen (N, azote) level or total salts as you measure with you conductivity meter?
With RO and PlantProd, you're not giving them any Ca or Mg. And 150 ppm is about 8-10 times too much, especially in an unsuitable environment like an office (way too dry). Get some crushed dolomite for the pots, and cut way down on the ferts. These plants are not using any nitrogen in their compromised state anyways.
You should supplement with Calmag monthly.
Tigrinum does not put out alot of root and it likes to dry out before watering. As we get warmer conditions it like to keep growing so water 2 times a week. Don't give it strong like but Phal light especially during spring and summer during active growth and lots of watering. During fall and winter the medium should dry out before watering and give it brighter light.
The suggestion of a smaller pot is a good idea.
Niveum needs to be looked at esp at the roots. They need an open mix with good drainage.
Good time of year to repot everything!
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