Many bubbles together with some unknown patches together

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Can anyone advice me on this?notice alots of bubbles on my tank as well as some unknown substances together ,does anyone know if this is harmful to fishes ?thanks

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That looks like BGA at the right side of your tank. Scrape it out. Does it make you want to choke when you smell it?

It appears when nitrate levels in your tank are very low, so that's good news for your fish. It's not harmful to your fish, but it is very unsightly if you want a planted tank.

[s9534891b]

That looks like BGA at the right side of your tank. Scrape it out. Does it make you want to choke when you smell it?

It appears when nitrate levels in your tank are very low, so that's good news for your fish. It's not harmful to your fish, but it is very unsightly if you want a planted tank.

Did u noticed the bubbles which are not moving ?are they harmful?

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Oh you are referring to the bubbles on the surface of your tank? I'm not sure how densely planted your tank is, but I'm guessing it is sparsely planted. There will be a protein film on the surface of the water in your tank. The bubbles gathered there probably came from your filter splashing water into the tank or something.

Do you happen to have a betta in there? It could also be the betta's bubble nest.