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Originally Posted by Aztec Reef lighting spectrum has no significance to color.. I disagree, there is a reason that almost all aquariums have purple coraline. Anything dependent on photosynthesis has a preference as to the amount of light....from coral zooxan to basic algae. My opinion anyway.

syconoid sponge ?

Cyanobacteria hates oxygen rich environments...make sure you have good water flow throughout the tank. Cyanobacteria is basically pond scum...grows in ponds etc because there is no water movement. improper lighting and/or direct sunlight from a window can also be a factor. my advice anyway for...

does it have syphon holes? if so, then it's a sponge in my opinion. Pink sponges are not all that uncommon.

Lighting is usually the main cause of which color dominates in my opinion.