Purple membranes

[all4a1000]

What is this ? I noticed it's growing and taking over my tank

 

[all4a1000]

 

[pennied]

Mmm cyano

 

[mww00ds]

Cyano bacteria. What do you perimeters look like?

 

[pennied]

Cyano isn’t only about nutrients and rarely is. Have any decaying matter in your tank? Age of said tank?

 

[all4a1000]

My test all come back close to zero for ammonia, nitrate and nitrite and 8 ph . Tank is about 6months to a year old , it cycled once and has had stable parameters since . I had 2 cleaner shrimp die on me and we have hermit crabs but their so small maybe some died

 

[mww00ds]

How does your alkalinity look? Also what kind of water flow do you have in the area? Low alkalinity can help speed up cyano growth and low flow can help it grow as well