I'm a fan of Cuttlebone and Hikari as foods with the other veggies mentioned. Just make sure to remove stuff (considering each kind might degrade at different rates) which will break down and foul the water.
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
I think it's around 4inches. Found someone who bought and managed to breed the blue one's. We were trying to get him to sell to us but no luck hehehe. Also found a pet store who got lucky and got some purple one's and was selling them cheap. Too bad when I got there they were already sold.