Yeah, you pay a cash amount to put money on it.
So say you want $100 on the card, you'll pay $100.
Maybe a little more, for an activation fee.
Usually only $3 or $5.
whenever i save up money to pay for a tank, i already have goldfish, but they are mum's. I would like to get a nice tank for a Betta fish i have owned them before.. you don't need to do a full clean out weekly, but waterchanges are good..and gravel vac's help with the cleaning speeds it up