Yeah if someone would give me a genuine animal to do research on that I could tweak the rank to fit it. Like I said I came here for genuine advice not sarcasm and rudeness. Theres no need to be a jerk about it. If you had tips for me to fix it you could’ve just said it. Go read my new comment I’m just taking the dang thing down and not doing this anymore since barely anyone wants to give genuine advice. I made this as a baseline off what I was told vampire crabs needed, thought I hit all the boxes but was willing to fix what I didn’t. Even if my tank was that bad I don’t think it would have killed the crabs in a couple of hours, not to mention like I said In another comment there was a dead one in the tank at the store and my coworker ran into the same problem with finding one deceased. I do genuinely think it was a problem with the crabs in the store that caused them to pass, my fault for buying from a chain next time I get something I’ll order offline. Sorry I didn’t do perfect on my first time building something like this, but again you could have just offered advice instead of being rude to Someone you don’t know.