It looks like I have cracked the code to a less algae infested aquarium. I have had lots of snails before, but I realised that I might have underestimated how many snails there are in natural conditions. Therefore I brought home a lot of snails, around 150 common periwinkles, and the result is so far good. In little over a week they have really grazed down a lot of the green algae and the rocks are starting to show through. The pink coraline algaes are also visible now. This is the “after” photo. Unfortunately I do not have any “before” pictures.