They are probably DP's. However these guys are little terrors, youl really will only want one in a 5 gallon.
They have beaks, so can do a LOT of damage. They use the beaks to eat snails, their favorite food. :D Posted via Mobile Device
That sounds like a better plan. If I may add, with goldfish, start as large as you can. I wouldn't start with a tank smaller than a 55 gallon. A 75 gal or larger would be better. I'm regretting not getting a 75 gal from the start. I can only have a max of 4 goldfish in my 55 gallon tank.