I have 2 plecos that ive had in my 30 Gal tank for months now.. I beleive one is male and the other is female.. I bought them when they were young. I noticed today that the female is pale in colour and is skinny like she is starved, and the male is grogeous and colourful.. I watched them for a while during feeding and the male actually chased away the female.. and made her go hide.. Im assuming thats why she is so thin and sickly looking.. What can I do to stop him from bothering her.. do I need to get another one? Is one male and one female bad to keep!?