Ola. Bem Dia.
Your tank is very nice and I love Lad25 (I have 4)
You will find however that they only clean up (algae) by accident when they are munching on bogwood which is their favourite snack. They will however 'hoover' up all the left over food items and clean the glass along with the Otos.
Nice greens in the tank and a nice simple structure. Being from Portugal do you like Philipe Oliveira's scapes? There seem to be quite a few decent aquascapers from Portugal (not including my wife who wants blue gravel and bubble ornaments)
Xiao amigo
Andy