Whether or not you want warm or cold water, you need at least gravel if no other decorations. The gravel is home to a huge amount of beneficial bacteria. Your tank will be much more successful with it. You will also find that the fish will be more attractive and apt to swim around with at least some shelter, even if plants are plastic. for feeding, just feed twice a day, a little at a time until they stop eating. (up to 3 minutes)
