Two of my best friends recently gave me a peacock eel for my two-week old 20 gal. The tank is 30 in long x 10 tall x 12 wide and the eel is about 5 - 6 in long. I just want to make sure that this tank is spacious enough for him. There are several large rocks for hiding spots and about seven plants as well. His only other tank mates are three platys. Thanks!!