With a 60 gallon tank (I am assuming 60 US gallons) you could have a pretty good size school of Zebra Danio in there and they will love the current. Now I might be a little partial to the Zebra Danios, I have 4 regular ones and 12 of the Glo Fish variety, so 16 in total, quite a large school (55 gallon tank along with 12 cherry barbs and 2 pearl gouramis). Now some people will disagree with me here and say Zebra Danio aren't colourfull enough (not true with the Glo fish variety) and just generally boring fish to watch (they are small grow to about 2 inches), but I say so not true, they are the most entertaining fish I have in my tank. They are so funny, zooming around playing in the current, they do school, but not tightly, in fact my cherry school and zebra school have joined forces and I will find cherries schooling with zerbras (also really cool to see) but they will school togethor, chase each other around, and they LOVE to play in the current. They are also really awesome to watch during water changes, they swim right up to me and nibble on my arm. They really are cool little fish, and with the glow fish option (only if in the US and not in the state of California - banned in California, most of Europe, all of Australia and Canada - zebra danio with ammenty DNA so they glow under black light - but will still reproduce - NOT STERILE) they really do add a lot of colour to your tank - red will glow a brighter red, yellow glows green, and orange glows yellow (I know weird but thier you have it).