Hi Rhodi! I'm happy you liked it. Good luck and keep us updated! So I went away for a couple days (yeah, I know, baaaad timing), but my brother took care of him while I was away. So I took out 75L water and since I only have one 25L can and it takes 24 hours to make new saltwater, I'm pouring the last can of 25L in today. This obviously means that the water was way too low and everything stopped. My circulation pump was broken and the filter, the heater, the skimmer and the overflow needed higher water so basically the entire tank was standing still. So when I came back home last night two of my shrimp died (quite possibly because I put three of them in a quarantine-thing, like a transparent box that floats on top of the tank. Also some weird algae started growing on top of the sand, like bubbles that are about to float up and then was stopped. So basically the entire bottom looks crystalized. Pretty cool, but I don't think it's a good thing.
Anyways, I know have just enough water for everything to run while I'm waiting for the last 25L, two shrimp left (one in the tank and one in the box) and Arthur seems to be a bit more active (whether that's because I'm killing him or because he is getting better, I'm not sure) and his color is pretty much the same, maybe slightly better. This weekend was one hell of a ride, but I think we can make it through.
Edit: Actually he still has that bad looking color. Well, sometimes. As he changes color every now and then, I mean.