That first pic is Vulgaris no question LOL Sitting on top of the rock looking over his kingdom which you just so happen to live in.
What's a good strategy for cleaning Frank's Tank he has a tug of war with every thing I put in there. There is a pile of fiddler crab shells he is protecting. Should I put him in a bucket when I clean his tank? How long can those shells stay without raising the nitrates to quickly. Totally a pack rat. He becoming a change to clean his tank, today he took hold of my siphoning hose and pulled all his rocks down. He does not like me touching his stuff.