cheap reef

Hey Nerds! *teehee* Anyways, boy oh boy do I got a little thread for you. This thread is for people who want to set up a sorta cheapish tank on their first run. I am cheap and I am not ashamed. So this all started when my family decided that it was time for my parrot to go. It breaks my heart...

Is it possible to have a cheap Reed tank that is 20 gallon? This includes RODI water system, lights, corals, fish, , etc. I have a 20 gallon tank with a rim and a penguin marineland filter that is currently running a freshwater tank, so my two questions are, can someone tell me if it is possible...