Hello, I have a 20 gallon Tall ( I did have saltwater but lived too far for live brine etc)..and would like to use thsi tank for a pair of mated discus. Is this okay for 20 gallon? I have an Eclipse hood (which did OUTSTANDING for saltwater). Do I need more? I am looking to mkae it a "showpiece" tank..with live plants, sandy bottomy.....with maybe two or three smaller bottom feeding fish.... is this realistic? Please....I have absolutely NO ego...all help welcome!!! (II really really really want to get a pair of mated discus)