It never hurts to have an airstone in the tank for extra oxygenation.
There are a few things I would like to know about your little guys to assist me in better answering your question.
1. What are your water parameters? (Ammonia, Nitrite, Nitrate)
2. What size aquarium are the fish in?
3. What type of filter are you running?
Those 3 answers will give us a clearer picture as to whether this is simply a behavior your fish is exhibiting or if it is a symptom.
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