Planaria worms will occur naturally if you have a well balanced/planted tank and continued occupancy by larger species of fish (like Cichlids) that will not eat them because they are too small.
Both would be appropriate, as long as the planaria can reach that food source.
The planaria class is Turbellaria
With knowlege and all the right equipment a small tank can easily be set up in an hour.
planeriacomes under kingdom animalea
They are "Planaria worms". They are harmless but they will become more numerous and eventually you will have to do a complete strip down and clean out of the tank in the not too distant future.
Planaria are type of animals. Animals are not photosynthetic
no because you just now set it up and it needs to cycle
sp refers to a planaria where the actual species is undetermined...or sometimes because several species of planaria have similar appearance or behavior and have been used in a study.
Planaria exist only in fresh waters.
Usually a planaria regeneration experiment involves cutting the planaria into different parts. The head can be separated from the tail or the planaria can be cut lengthwise, etc. After cutting the planaria, it will be observed for few days noting how the organism regenerate its lost body parts. Read more on planaria regeneration on t he link provided below.
Planaria prefer dark environments
Provided the tank is clean and has been set up correctly there should be no problems.