My Clowns are being weird

[AmyAmy]

Hello! I hope I am doing this right lol. I added two Clownfish to my 20gallon tank 4 days ago. This is a brand new tank and my first attempt at salt water tanks. They seem happy and are eating. They stay active and engaged all day long. The issue is in the morning they are both either on the bottom on their side or swimming on their side at the top. I have been adding ammonia treatment the last 3 mornings and they recover almost immediately and are fine for the rest of the day.
Is there something else I should be doing?