Hello. I've just been to the fish store to buy the sand, rocks etc. but the fish store guy said to do a cycle with fish. The guys there are nice and I asked them if there was anyway to do a fishless cycle but he said it needs a fish to cycle and produce waste/ammonia (which I thought was wrong, but didn't say anything and now I'm disappointed). So my parents ended up buying 9 neon tetras since they were the cheapest but I'm worried they'll die since they are not beginner fish and not hardy. Can I please have some tips and advice to keep them alive during the start of a cycle because I don't want any of them to die. Thank you.