Has anyone got any experiences of both these. I am upgrading to a 190 Litre tank. I have: Neons, Halerquin Rasboras, Pentazona Barbs, Rummy Noses and a Dwarf Otto. I am looking at what others to get and am interested in adding some Tiger Barbs, some Denisonii Barbs and either a Red Finned Shark or Red Tailed Black Shark. I prefer the Red Tailed Black Shark but have no experience of it and don't know if it would be unsuitable to mix with the other fish above. Would the Red Finned Shark be better or would both be unsuitable. Any advice gratefully received.