Probleme mit befruchtung der Eier - L134

[Lihn]

Hallo Forum

I am a guy from Denmark who have a few catfish species. I have some problems with my Peckoltia compta which lays a lot of eggs but the eggs isn't fertilized and therefore I am asking you for help..

My L134 probably laid eggs for 8-10. time! But out of all those times I only had 1 litter out of it (it was for 8 broods, although there were slightly more eggs). The eggs are white after 1-2 days, and rotted. Is not it a sign that they are not fertilized are?

There are 10 fish in a 100 liter (I know it is crowded), with a lot of caves and roots. Is it because they get distracted by each other?

I've tried to take the eggs off, as I suspect the male not to fit well enough on the eggs, but not this I can get to succeed. The eggs are rotting, no matter how much air circulation and they are getting.
There are 2-3 males that breed (and also more females), but none of them can figure it out.

I have L260 and Hypancistrus versus its breed as well same water (but another aquarium) - there are no problems.

Water quality should not be a problem (well functioning filter and when the fish spawn, it is always after a 80% water change). 7 in pH and max 10 in kH.

Why can my L134 not figure out how to breed?

I fully understand the Germen language so just reply in your preffered language - it is just easier for me to write in English