We have an tank with 5 Rummynose, 3 Neon and 5 Glowlight Tetras, 3 Peppered Corys and 7 Harliquen Rosboras and we are thinking of getting some Cherry Barbs - it is a 90 litre hexagonal tank. Can anyone let us know if they will fit in and if so - how many is a good number? Cheers.