In my opinion neon's and / or tetras.
pet smart' petco' walmart
For filtering aquarium water and fish tanks for healthy fish. This pet supply offers advanced pumping of the water and is not dangerous for fish reliably cleansing multiple fish tanks of varying size.
The best selling pets are a fish,guenea pigs,and hamsters they only approx. cost $8.99 but the cages and tanks cost approx $24.00.If you have a fish tankthat could work for a guenea pig or hamster.
Your pet fish wouldn't have a place to live
no they need at least two fish tanks if its for a pet
you can get a machine from pet smart and they sometimes look like volcanoes. they are meant for tanks but it should work outside.
YOu can buy them online at Amazon.com. You can also buy them at local pet stores.
That is an opinion i say a bird or fish but remember even small animals can make a big or small or huge mess !!
fish
a small goldfish or any type of small fish
even smaller fish, but however if it is a pet fish then talk to your local pet store for what to feed your fish.
small pet fish get up to 4cm high