ID please

[MNBones]

I suddenly have a lot of these in my sump. Good or bad?
Thanks ahead of time!

 

[Zach B]

Sponges most are beneficial filter feeders. I have these same ones in my sump with no ill effect. Best of luck!

 

[MNBones]

Sponges most are beneficial filter feeders. I have these same ones in my sump with no ill effect. Best of luck!

Thanks.
By chance would these guys consume a lot of nitrate? My readings have gone from around 15 to less than 5 over the last 2 weeks

 

[vetteguy53081]

I suddenly have a lot of these in my sump. Good or bad?
Thanks ahead of time!

poriferan sponge and likely clatherina