I have a bottle of Rx on the way and should be here tomorrow. I am dipping my zoa frag due to nudibranches. I also have a GSP frag which is doing very well. My question is, how often do you dip? Once before placing in the tank and then just as needed based on appearance/health? Also, should I dip my GSP frag even though it hasn't had any issues? Both frags have been in the tank for 4 weeks.