The manifold. I cushion it with gravel underneath to avoid vibrations against glass.

Need to still add a few smaller plants (not much in this biotope), so light is off. Debate to use the 2 small logs or replace with one large one?

I have question about temperatures. The fish that I plan (also danios, an Indian torrent catfish and rosy barbs along with loaches) like cooler temps, but powerheads seem to heat water somewhat, so temp at 24 C at moment, but they prefer more 21/22 C in summer. This despite cooler air temps at moment (was 26 earlier). Not sure what to do?