it's a LED submersible light bar. it was cool for a while,
but i ultimately out grew it and use the green spot lite
on the bottom right coming off my aero Co2 diffuser.
before I had live plants, I used a horizontal spray bar
for the sound and bubble action, but now I'd rather
just conserve as much Co2 as my DIY can provide.
I'm removing the Limnophila Aromatica to a RAOK sale,
and relocating your plants to that back left corner.
sorry my tank is not really styled much as I'm in the
process of trying different plants to see what I like.
your Hygrophilia polysperma 'Sunset' will look better
in a week once the leaves unfold since being shipped.
after pruning and lighting upgrade from 72w to 130w;
