Well done Emma - had a quick search on that and they are quite cute when you can see them properly. Reminds me a bit of one of the marine fish I had years ago, a Porcupine puffer called Oscar - he was very cute too. :)
I'd looove a puffer fish, the sweetest fish I ever saw was a little baby long horned cow fish, just the most interactive little animal, it's what got me interested in fish. I was strongly considering a tank of dwarf puffers but I think my pH 8 super hard tap water would be too much for them and I don't want to go down the RO route with my big tank.