Help indentifying this

[mobehtaReefs]

Does anyone know what this is..saw it on my rocks..tank is 6 months old and parameters are perfect

 

[vetteguy53081]

Poriferan sponge. To remove , take rock out and expose it to air, then scrub off with peroxide and stiff toothbrush

 

[mobehtaReefs]

Poriferan sponge. To remove , take rock out and expose it to air, then scrub off with peroxide and stiff toothbrush

Thank you for the response...are they dangerous to my tank health?

 

[vetteguy53081]

Thank you for the response...are they dangerous to my tank health?

No but can be evasive