failing with moss under lights

[Jeff9]

hi all, i started growing under lights about 5 months ago.
the plants are doing fine and some have flowered.

i bought epiweb moss mix from a dusk se retailer and put it on all of the mounts, its been on for at least 5 months now.
all i have gotten to grow so far is a few really tiny moss strands and the rest all turned into green algae.

sometimes i see people posting pictures of plants growing under light in alive, fresh sphagnum. my sphagnum just turns straight into a slimy algae compound and not a single sign of light.

some moss is growing tough, but it is scarse and i would've expected more to grow from the moss mixes.

is it too much light? temperature? humidity?

thanks