Preferably zero goldfish, but that's just my opinion. If u r able to get any from a bait shop/Walmart or some other shop, maybe it wud pay to setting up a worm farm rather than feeding goldfish. I had problems finding worms, esp. during early part of our summer as our soil is hard clay and I dug up numerous areas of my garden. I now have an established worm farm and compost heap works well too. Since it has been raining I have also been out lifting plantpots/chairs to grab the worms that pop up beneath them and add them to the worm farm too.