After having moved all the fishes from my bottom 325 liters (which is going to continue as Malawi-aquarium) I have emptied it for water and gravel, and replaced with my new fine sand and filled approximately half the aquarium with water. Tomorrow I'm going to plant some plants and move a lot of fishes, again.
I have moved a Labidochromis caeruleus-female to my 100 liters, but it will last at least a week or more, before she is going to
release her fry.