I am not only new here, but I am new to fiddler crabs. I purchased four FC at Wal-Mart. I went through the internet to get some info about caring for them. I am using a 6 gal Sterilite & just got this mini filter. I keep the water "brackish", and use aquarium salt. I have a big one(I call him daddy), I have a female adult, ( I call her mommy), the other male( JR.) is not quite as big as the daddy;however, he is about as big as the female. The baby, is a female ( I call her just that!) I noticed that the (daddy) has been picking on her, I looked it up, and sure enough, the article said that the bigger males pick on the babies. I am worried that the daddy will kill or hurt the baby. I wonder if I should separate them, or what. I was wondering about molting and was thinking that when one of them is going through that maybe they ( FC) would feel safer in a separate tank until they get better. Don't worry! I won't do that unless you suggest it. I was just thinking that the FC might like some privacy. They look healthy. They spend alot of time hiding in between the rocks and this little cave.
Lisa
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Welcome and congrats on your new fiddlers. 
, but I just wanted to mention that you should probably use Marine salt rather than Aquarium salt for your brackish water. High-five to you for doing some research first and putting them in brackish and doing your best to make them happy. Hmmm, maybe if they have multiple out-of-water areas that they can access, then they would be able to escape one another if needed. 
