Fishes breathing heavily

[Flaming Nemo]

Hi all,

I having a weird problem here. I have a damsel, Nemo and Domino. These few days these fishes are breathing heavily and very fast.

But they seems active in eating and sleeping. Seldom comes to the surface for air.

Testing my ammonia = 0 , Nitrite = 0

What is happening? Is my reef corals in the tank some what release unseen toxic

Btw i have= a xiena, soft corals like finger, toadstool and sponges

Pls Advise

[Achilles Tang]

Perhaps they are not getting enough dissolved oxygen in the water? Do you have a skimmer working? Can you give more details on your tank setup pls.

[flying carpet]

Yup we need your specs bro.

[cjh]

asthma... lol... jk...

[Qxnviolet]

Erm, what are you using for water turnround? Insufficient flow rate could cause a lack of oxygen i think...