My mum got me my first fish when i was like 12 i think :) 3 gold fish in a little 10 liter bookshelf tank, but now i'd never put a another goldfish in that tank again, its waaaaay too small. Now i my largest tank is a 5 foot with my adult oscar and i got my eye on my uncles 6 foot. haha
Buuuut mum says no more fish, ( i have 4 empty tanks) not till after my holiday at least, i can see her point tho, im going away for a month, and i actually have no room, been trying to convince mum to move out ;) i was going 50% water changes daily on my Oscar tank when i first got him and i dont have to pay for water sooo...
But now fish keeping is a serious hobby for me i even give my brother the riot act and hes kept fish for longer then me haha! but when a friend gets a fish i gently coach them on how to look after them properly, one got two Bettas, which have now actually died :'( she had them in these little 500ml containers and i said to get them in a bigger tank and heater but at least she took my advice and tried.