I have ghost shrimp in my big tank. I added some Flourish Comprehensive Supplement right after I added my 10 baby ghost shrimp last Thurs. I haven't seen them since. Today I did a 50% water change and low and behold I have shrimp swimming around. I read on this site that someone had asked Flourish about the copper since it's 0.0001% copper. Their reply was that it was okay since it was such a small amount. I think my shrimp came out after I got most of it out of my tank. What do you guys think? #2. I'm getting some red cherry shrimp and I read that ghost shrimp will eat the cherry shrimp. I've only seen 4 ghost shrimp and I'm getting 15 RCS to be divided between my two tanks. Should I be worried? The ghost shrimp are only in my big tank not my little one.