tell me about air pump timer

[Muhammed Saad]

please tell me about air pump timer.i fit timer on my air pump.my pump work for 5 min and stop for 10 min.tell me is it great for fish or not.

 

[tanker]

Air pump??? For what, an airstone?? I would use a PH. Airstones, and air pumps not that good for SW.