We have been running this line for many years. If you are looking for a simple trouble free line this is it! When I was about 15 years old I worked for A petshop that was in Upper Michigan. The owner would take the 3 hour trip to Detroit every other week to buy stock. He bought his aquarium fish from a large wholesaler by the name of Fish Unlimited. It was across from the old Detroit Stadium, A neighborhood that had long been run down. Walking into the old world fish wholesaler was a treat. Hundreds of aquariums greeted me, each Of which changed stock every week. In that magic place things that dizzied the mind were everywhere. It was then that I first layed my eyes On Half Black Yellow Delta Guppies. In a place where every aquarium dream could come true, they sparkled. Since then guppies have come and gone over the years, but this line remains magic to me. I guess that was back in 1982. God I'm Old :0) I believe that you will love this line as much as I do.