Well my view is that a 100L tank is small.
You are overstocked clear and simple. Also poorly stocked. Chain loaches need a group as they are social fishes. The molly's, chain loaches, and Kribs would be ok for now.
The leopard pleco gets to 20", the Clown loaches get to 18" - that is 50cm. IMO you should rehouse them in the next weeks, certainly not years.
Clown loaches, like all fish, need space to grow when young and small to grow and develop healthily. They are a social species and need to be housed in a group as well.
Fish keeping is about looking after the fish appropriately and housing them in what they NEED, not by what you WANT.