Here's my Cubus before I retired it.
That stock LED light will have trouble growing anything (including Java fern) so I wouldn't even attempt any other plants without supplementing with another light source.
As for fishes, I can't think of anything other than a betta that will be happy in that tank for long. I would stick with cherries alone.
See the link above for the heater that I used. It worked quite well and easily hidden behind the planting. Depending on your room temperature, you can get away with an unheated tank for RCS.
That stock LED light will have trouble growing anything (including Java fern) so I wouldn't even attempt any other plants without supplementing with another light source.
As for fishes, I can't think of anything other than a betta that will be happy in that tank for long. I would stick with cherries alone.
See the link above for the heater that I used. It worked quite well and easily hidden behind the planting. Depending on your room temperature, you can get away with an unheated tank for RCS.