Carolyn,
Hi, I hope I did not offend you in your choice to go to freshwater. I know that SW can be really expensive, just ask me I pay an arm and a leg here in Canada for every piece of live rock and coral and also the fish
But I do love my FW tank and I don't think I will ever give it up. What size is your tank?
I do have one good piece of advise, when you are looking to get a plecostamus do spend the extra and get a Bristlenose, they are the best. I have had FW for over 20 years and have gone through so many plecos. The Bristlenoses stay around the 4" range and don't get big. I think they are better cleaners and well worth the money.
As for your bottom, some people use sand in their FW but if you have live plants that can post a problem with not enough movement getting into the sand and causing posioning to the fish and water in the tank. I would go with a gravel bed of not super fine but fine gravel of natural color.
You will not need a skimmer and your filter what kind is it? I would just clean it out really well and rinse good and it will be just fine. You will be starting this tank as a new start up unless you have some already cycled gravel and water to use. So if you don't take your time and do a complete setup of a new tank. The whole cycling thing etc.
There are some very lovley fish out there in the FW, some of my favorites are: neon tetras, diamond tetra :yes: , cherry barbs ( not like the nippy barbs, these ones are small and nice), white clouds, gouramis, angelfish (if tank is big enough), platies, mollies, guppies, swordtails and the list goes on.
I have bred guppies and most livebearers on a large scale at one time. Also angel fish too, now my 25 gal is just a nice display tank with live java fern, a piece of mopani, one bristlenose, two angel fish and a few platies, white clouds, and cherry barbs. To many for this tank but no one seems to be croaking at the moment. The must be very happy :yes:
Good luck to you and if you need any other help let me know, I would be glad to help.
Debbie