Oh, and to update on the dinos. When I changed out the sand in the center section, I had to remove a lot of the rock to get it out so I ended up scrubbing the piece that would sprout tiny little dino blobs. Well, the last section will probably be the same, and I have one problem rock on it as well. I think I can remove it easy enough. I thought about soaking it in a 50/50 peroxide solution for about 5-10 minutes after I scrub it off. Other than that, I only have the dark algae on the remaining sand and on small areas on rocks, and if it is dinos, I will scream loud enough for Meowzer to hear me at her house lol. Also, I might do a water change today, I have another 20g made up and ready.