I think it is my first post in the forum

in first a little presentation: I'm 18 years old, I have 2 aquarium of south america fish, a 200L and a 45L and 2 terrarium. I study biologie in a highschool.
Now the tank's presentation:
45x30x30cm, the filtration is a Eheim Ecco 300l/h, a Eheim pump of 300l/h for the wave.
The sand and the piece of wood with the moss come from a rivier near I live, and the stones come from the swiss Alps
There are 2 hypancistrus debillitera sp L129 in the tank.
I want to try the reproduction
a photo:

I try to take photos of the fishs this weekend
suggestions and criticisms welcome
Corentin