Worried about my mollies

[BZimon]

i have roughly a dozen mollies all seem keep on the top level swimming around, as in they are looking for something, i fed them. what else they looking for? please help

 

[dixaisy930]

Have you checked the ammonia and nitrite levels? Maybe it's an increase in one of these two...what size tank do you have and how many fish in the tank?

 

[BZimon]

now they seem fine, i just added some bubbles i guess not enough Oxygen