We recently bought a 64L tank and did everything needed to set it up (we hope lol). Then we bought out neon tetra fishes (6 of them) but within a day 2 died.....our son was so upset. What we could not understand why one died as shown no disease but the other one went into the filter ( not sure how but it was very tiny one) . So we are now eventually going to get some more fishes but which ones are good with neon tetras?