Don't worry each to their own, my work colleagues think I am nuts cos I love my cats and my fish. They just don't get it, so don't worry about them.
good luck with your tetras, they are a beautiful coloured fish. I have found that cardinal tetras tend to last longer than neons (good job really considering they cost a bit more)
I did manage to gravel siphon a black phantom tetra once, didn't realise he was there, he didn't make it up the tube into the bucket, just got pelted with the flying gravel. I felt so bad for him, but he made it and still lives today . I think they like the siphon hose cos they can see stuff they think is food floating upwards.