I have a 19l tank which I contains 2 variatus platys. Just realised one is a female and one is a male. The male has been hiding in the plants since I moved them into the tank yesterday. Although the female is swimming around happily. The tanks water levels are fine, I've tested them. I introduced the fish into the tank properly, and everything seems to be running fine. I just don't know why he's hiding? Any ideas? Could he just be shy or scared?