Questions about plecos

[rgreen]

my name is Rhonda and I have a 55 gal , live plant , 3 month old tank.

I am thinking about a king (l333)or queen pleco, or even an L172a Gold Hetradon.

My questions are:

1. Will either pleco eat my plants?
2. Should I just have one pleco in my tank, one reason, they fight?
3. Do they get aggressive with other fish?
4. Is 3 months too early to put a pleco in?


Thank you