55 gallon

[Molino]

and hard to tell by the picture but you might benefit from a sand sifting goby to keep your sand a nice white.

I plan to get a Goby for just that reason very soon.

Is that a bit of cyano I see?

I'd never heard of Cyano before now so looked it up on Google. It appears to be the same colour, but it refers to Cyano algea as slimy. The redish/purple spots you see on the substrate of my tank are almost hair like or fuzzy and grow in clumps which can be removed very easily. I'm not sure what they are?