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One bad thing did happen (sad)... the Apistogramma borelli male had passed away. He got a very bad "hole in the head" disease, and suddenly in very short time had died.
I wasn't ready for using medication or salt to remedy this type of sickness because these cichlids are very sensitive to changes. Instead I tried to feed him with a varied diet (worms, artemia, vitamins). It obviously didn't help.
The rest of the community is doing fine though.