Interesting looking at the tray as a whole, the areas affected by algae looks like it is circular in shape and emanates from the mister in the centre. If this is the case ( hard to tell from a phot viewed on a phone), would an adjustment to the mister be needed, be it position/ height or frequency of misting? Just a thought, anyway.
Yes, good observation - I think this suggests the mister is on too much, and wetting those substrates immediately around it too much.
I used to get similar slime in my setup.
Best course of action is to dry the substrate in order to keep it check.
Tbh I never had any standing water at all in my setup.I rarely misted and any water in the undertray was discarded after misting. Think in the lines of damp house plant pot consistency. Even if the top dries out a little is not a biggie ,as long there is moisture in lower levels it will keep the humidity high enough .
Thanks @Konsa - I think you're right, the substrate is too wet, probably because of the mister, and the fact that the bases of the pots are essentially submerged by 10mm or so.
In your set-up, if you had no standing water, how did you keep the humidity high enough? Did the leaves mainly remain dry most of the time - I've been trying to maintain humidity to the level that there are actual water droplets on the leaves, as per Darrel's advice here:
Just to clarify, are you growing your mosses directly on lava stone or on top of aquasoil with lava underneath, it isn’t immediately obvious your method from the post. Hey Garuf, the mosses are grown directly on lava stone.
How often did you manually mist yours?
Also why not try granulated fertilizer in the medium as nutrient rich spray is probably helping the algae development.
Can't comment on the rock wool as I always used potting compost in my setups.
The water in the base of the propagator is loaded with the most nutrients, so I've not been adding much with manual misting - I'm just using pure RO with a small amount of micros and Rhizotonic in. I might change that down to pure RO though, and just have the nutrient solution in the base.
I could do away with the mister entirely, I'm just paranoid of the plant leaves drying out too much? But then I look at the Tropica/Dennerle videos, and they don't look at all wet 🤷🏻♂️