Hello, to start of I'd like to say I am new to owning tiger barbs and I'm not sure if maybe this is normal behavior. Anyways, I have a 20 gallon planted tank and today after stocking it with 5 tiger barbs there is one that is hiding in the top corner of the tank while the other 4 are swimming around with each other and acting as I expected all five of them to do. I looked up a few past situations like this and saw that a lot of people say I would need more fish and/or that this is a normal behavior for a male tiger barb. I am not sure if the hiding one is a male but I'm pretty sure of the other four they are 1 male and 3 females. I was just wondering if maybe this is a normal thing or if there is something I can do to help. Thank you again for any help.