its growth is steady, not necessarily slow as it makes abundant plantlets forming a clump.
you untangle them and replant increasing the size of the group.
for me, success in aquasoil with 0KH and GH ~4.
CO2 is delivered by misting during lights on.
I dose nutrients lightly and use a shorter photoperiod but light is intense.
7 hours of HQI over a shallow tank.
I have removed heavy water column feeders from the tank, to keep nutrients more balanced.
so no fast stems, no greedy hygros etc.
KNO3 / KH2PO4 are dosed 4:1 by weight.
lightly but consistently from a solution mixed weekly. traces added by TMG
after 5 days a water change of about 30%
I reconstitute GH to 4 at that time.
most of this routine is to encourage stability and consistent parameters.
it changes as I alter the sp. mix but I have settled on a routine for plants like this.
so for now they are together in a pair of tanks and the routine is not changing.
I haven't tried to grow this in excel alone, or heard of an attempt.
so let us know how that turns out coralite.
many who keep this one use typical erio conditions and I think they work well.
watch that epiphytic algae does not get on to it, and that conditions in the water do not change.
at first I had success, then I lost several plantlets due to careless maintenance.
so I learned my lesson (again and again) and stick to a steady routine.