Can you put small fish in this? Can you put 2 kits together?

Hello, the smartpond Complete Filter Kit with Pump is an all-inclusive filtration kit designed to improve the water quality of a pond up to 500 gallons. Depending on the size of your pond or water feature, you can add two of these Complete Filters, which will optimize the filtration and would also give you two lovely waterspray nozzle displays (one on each). This Complete Filter Kit with Pump does not house fish directly in it but it is ideal for filtration in a pond or water features with fish. We hope this helps!