I am starting a mid to heavily planted freshwater aquarium and was wondering what the best filter to use would be for a 30 gal tank. I have read that plants can not thrive with undergravel filters and that they disturb the flow. I don't know much about internal or external filters but that seem the way i am going to have to go. What would be the best, most realiable, and most efficent filtering system for my needs (product/company name would be helpful).