Hey all, my fish are growing! I picked up an oranda goldfish, about 3 inches long, from the petstore i work at. Currently he's hanging out in my cycled 5 gallon (only for a a day! ) I want to set him up in my spare 20 gallon tall, with a 200gbh HOB marineland biowheel filter And an airstone for extra oxygen since the tank is taller and not wide, the airstone should help And some plants as well. I have a few questions. Substrate? I love sand and have a bunch of extra laying around or should i do barebottom? Not sure i like the look but if it will be better for the fish, i can deal Secondly, would i be able to have an tankmates? I know another goldfish is a no but could have some kind of bottom dweller at all? If not thats fine. Tankmates are not important. Third. Any extra advise would be great, this is the first goldfish i have had in a long time and i want to do it right this time. Also, i cannot upgrade the tank at all. From the research i did, many have said that a 20 gallon is a good min for a single fancy goldfish, i also do not have room for a long aquarium so this also is not something i can do. Thank you!