Having a bit of an issue with some Hygrophilia polysperma 'Rosanervig'. The problem is - It's creeping across the substrate - rather than growing vertically.
I've tried various pruning techniques, but the problem remains.
It's a 55g tank is running 2x40w(t12) 2x36w(t
for just under 152w of NO flourescent. pH 7.2, kh 140ppm, DIY CO2, PMDD ferts. Rather heavily stocked (6 5->6.5" discus, 4 bolivian rams, swarms of ottos and amano shrimp)
The tank gets about 1.5-2hours of direct sunlight first thing in the morning, I don't think that should be causing the problem. (Didn't find the window until after the tank was installed (its 16' above the tank) and there's no other place to put the tank) I'm way up in the north, so during the period the sunlight does hit the tank, it's not overly strong light - not as bright as the artificial lighting.
The H.P. does pop up vertical shoots, but they fall over and start creeping within a week. Pruning the runners has resulted in a very bushy 'globe' like plant. Frustrated today I ripped out the plants, replanting only the vertical stems - but previous attempts at this method have resulted in the same growth. I don't anticipate 'proper' growth...
I'm out of ideas, is there some nutrient I might be lacking? I can't see the lighting causing this... Removing 1-2 bulbs has been tried - but hasn't helped.