How about an oxygen-increasing household blower in a fish pond? Is it ok to connect a long pipe?

Depending on the size of your pond, ponds below 5 mu can be aerated by vortex blower, connected with PVC pipe, and then aerated by gas stone or aeration pipe (aeration plate).

For outdoor ponds, roots blower and air outlet can be used to connect PVC pipes, and then connected with aeration pipes (aeration discs) for pond aeration.

The length of the pipeline is determined according to the power of the blower. Not too long. It's too long, and there's no air behind the pipe. The pipe diameter should also be appropriate, and the diameters of 32, 50, 63 and 75 should be determined according to the power.