I have 4 suction cups in an open-top aquarium and I have just noticed that they are covered in a white slimy substance (it has a very slight yellow tinge to it too). To the touch it resembles a cream that say you'd apply to the skin/face.
There's also a bit growing on the output pipe.
Take a look:
The aquarium receives little light as it is currently not stocked.
The aquarium is also undergoing a fishless cycle.
Any ideas on what it could be? Thanks.
Edit: Slightly dreading that the aquarium growth described here: Help! - Orange Slimy Matter Growing On All Surfaces | UK Aquatic Plant Society is returning again.
There's also a bit growing on the output pipe.
Take a look:


The aquarium receives little light as it is currently not stocked.
The aquarium is also undergoing a fishless cycle.
Any ideas on what it could be? Thanks.
Edit: Slightly dreading that the aquarium growth described here: Help! - Orange Slimy Matter Growing On All Surfaces | UK Aquatic Plant Society is returning again.