Acans Not Inflating

[Shep]

So I have notive that over the last few days some of my acans are just not inflating at all, what could be causing this?

 

[SeeingGreen]

When was your last water change?

 

[Shep]

its been about a week or two, not really sure. I am in the process of doing one as we speak.

 

[ritter6788]

What fish/inverts do you have?

 

[Shep]

Gold assessor, Green Mandarin, and one chromis. As for inverts I just have two small hermits and a few snails.