can a l-190 be kept in extremely low ph like 4,3 to 4,8?

Hi i,m settin up a new tank
185x83x80 cm
After decoration there,ll be 1000 liter left
I,ve got a sump 150 liter
An eheim 2280 for cleaning the bottom

Fish
10 wc altum
2L200


Now my question how many corys concolor should i put in?

I hAve to make clear that i have the l200 highfin

Someone on another forum wrote that these fish produce
A wood "dust cloud"wich could harm my altum or discus is this true

The atabapo and ventuari are both connected to the orinoco
river and in the e-log it says metae come from the orinoco
I just wanted to know a bit more specific

But i don,t want to breed how about agression?

are corydoras metae also found in atabapo and ventuari river?

Hello i heard from several people that concolor corys. Are shy is this true?

Hello is it ok To combine l 128 and l200 in
a 185x83x80 cm tank?i don,t want To breed them