They will be all fine.
My only remark is that you should make sure that the threadfins get enough food. The furcata and the Gertrude are much more athletic and will eat most of the food.
The threadfins will go to the bottom and look for food there too. Furcata and Gertrude seldom do that. So overall the 3 species will do fine toghether.
I suggest you look for an internet seller that has all 3 of them AND provides full guarantee on the shipment.
--Nikolay
My only remark is that you should make sure that the threadfins get enough food. The furcata and the Gertrude are much more athletic and will eat most of the food.
The threadfins will go to the bottom and look for food there too. Furcata and Gertrude seldom do that. So overall the 3 species will do fine toghether.
I suggest you look for an internet seller that has all 3 of them AND provides full guarantee on the shipment.
--Nikolay