space is not a prob i have no experience in keeping sw tanks . so that is why i intend on buying an nano for now . i do have an 3 foot tank ii intend to convert it to sw but don't know where to start
Great, start on that if you like,my first reef tank was that size it flopped but took alot longer to flop then if i had gotten a nano like 37lt.
Since size isn't an issue rather convert this tank rather than start with a nano.
Nano's can be more finicky and hence can be more work if you mess up.
Ok lets see some pics of your tank and i need to know what you want to keep before i can advise you further.
Softies and hardy fish?maybe some lps?
If so then the set-up can be very simple.
Just remember one thing once you started,you FILL-UP your tank initially with SALTWATER then when water evaporates you TOP OFF with FRESHWATER.Reason is salt doesn't evaporate only the water does.
Since finances are tight i suggest you buy stuff of the for sale section,can save you a packet buying things others have grown out of.
Post some pics first and we'll take it from there.