being new to this hobby I have many questions. I want live plants. My neighbor says to have an undergravel filter and I won't have to clean or change the tank for years. The plants will do great. He claims his has been up for years and I think it looks great. Full of large plants doing well. I have a canister filter on my 4-5 week old aquarium a couple of plants looking poorly no undergravel filter. I don't know which way to turn. I really need help. My neighbor claims to have been doing this for 20 years or more. Is he right? Please help!