I have both in my tank and I wouldn't trade my Pep. Shrimp for a Purple Hornet frag. I used to go thru a bottle of Aptasia X every month. I got about 8 Pep. Shrimp and I buy a bottle about every 6 months. My over flow box has a bunch of Aptasia in it and I am sure that wilth out the Pep. Shrimp in the tank I would still be going thru a bottle of Aptasia X a month. I don't see them in the tank except when I feed the tank, they come out a grap a pellet or two and I also feed them a piece of shrimp every few days, they are big, about 16 to the pound LOL, well maybe not that big. I am down to four now though and I am sure that when the lights are out in the tank, they are out doing their thing.