Before you add anything to your system, sit back and contemplate what the addition will do for your system and will the impact be short term and long term. if the answer to theres questions are ok and the addition will contribute to the system then add it, however, your system will need time to mature and the 1st thing is to get a bacteria bed established. you've heard of new tank syndrome which is nothing more than a bacteria bed not being mature enough to handle the bioload added and it crashes, or, supercharges and takes out the majority of the oxygen available in the water collum. so establish your bacteria bed and add animals slowly waiting 10 days between additions. this is very general and im sure as you get there we can be more specific, I just wanted to share the main thought at this point. welcome to the site and good luck. posting your questions in the general forum categories will get more responses to your questions. again welcome.