I checked on it today and it looked like there were about 12 hanging out together at the top of the big rock - unfortunately most of them dispersed when I got close to the tank to take a photo!
The algal film on the top seems to have become less thick since I added the Biodigest. It is now more speckled and less like a layer, which is good. I saw a shrimp upside down, so I think the shrimp may also be feeding on it.
Tested the S.G. again after topping up, it's currently roughly 1.011. I will test pH, KH, nitrates, etc later.
Although I don't like the algae on the glass and the top, I do like the look of it on the rocks, so I think I will leave it for now.
Last edited by Halocaridina on 22 Oct 2016 16:58, edited 1 time in total.