Ok good to know. I just figured that since this kit was designed for shrimp everything should be shrimp safe but to be safe I might take it out before the next water change which could be the catalyst to some breeding. Thanks guys Everyones help is much appreciated!lol. My experience with styrofoam in a shrimp tank was not a good one. There could be chemicals from the foam that may (or may not) leach into the water column. I'm not saying that's your problem, but if it were me, I would not use it.
If they're only 1/2" in size, they're still sub adults which are almost ready for breeding, but not quite yet. Give em another molt.
Also very good to know. I haven't had any issues with my background but I have more CRS coming in next week just in case I have all malesI've used several of the Fluval Ebi kits - before moving up to a tank rack system with larger tanks - and the only issue I ever had was the foam staying in place. I had to add aquarium safe silicone to the back of the foam and re-attach it to the back of the cube. Other than that, I never had any issues with S+ and up shrimp. One of the tanks that I had in my office at work, I bred several hundreds of CRS and CBS. I started with 18 young adults, and it turned out to be a great success. I did do water changes of about 15-20% 2x a week with R/O re-mineralized water. Also, instead of the stock filter, I used an ATI sponge.