Hi there. Just want to take your advice on what fish I should put in my tank. The tank is about 10 weeks old now. 72l in volume. Currently it hosts 3 otos and 3 or 4 Amano shrimp as janitor crew. I am looking for a species as follows: Small fish (maybe around 10 - 15 mm in length for example but not strict) Not brightly coloured. Black, white, grey, silver, brown etc. Maybe a tiny splash of brighter colour if subtle could be attractive. But must not be dominant colour like neon tetras). Most importantly is I would like a species that schools tightly together. So far I have one ideal solution: Corydoras hastatus. I saw them in a display tank and they are perfect in all above respects. But I can't really find them on sale here in Singapore, so wondered if there are any other suggestions...?