Hey, I use apitasia x in one tank and bergia's in another. You really only need two medium bergia's or three to be safe and as soon as they find a food source they will start their reproducing. I have 2-3 new egg batches every 1-2 weeks. It is slow to start out but once they get going it will be done in no time. I waited for one of my 40 gallons to flourish with apitasia and then got my bergia's and they did a great job doing their thing ever since. All this is dependent on you not having any of their predators in the tank. Another way I have found to work depending on tank set up, is in my QT tank the copper medicine took care of the apatasia too. But if you have fish in there don't over dose and don't do this at all if you have inverts, but it also took care of a few fire worms I had in there too. Just a bunch of food for thought for you.