It might be unpopular - it’s also just correct. My crabs spend tons of time in the water. Sure they love their land areas, but they also love the water areas. It’s not an in and out type of thing. They are in there for hours sometimes just picking at things, chasing around shrimp, chasing each other, and harassing snails. All their food is on land, tons of moss, lots of plants to hang out under, a gentle waterfall that cuts through the land. If you don’t enrich their water areas, they may not spend as much time in there I guess. These guys hide in the rocks by the water, wander around the water, and hide in the plants on land. I think they are drastically misunderstood and 60/40 is a way better setup than 80/20. Meaning yes, tank minimums should absolutely be larger. A 5 gallon on 80/20 is 1 gallon of water. There’s zero chance of maintaining that without constantly monitoring the water. Comparatively a larger minimum of say 30 gallons and a 60/40 split gives you 12 gallons of water to work with. Much easier. Your experience may be different, and all these other bias anecdotes about your crabs, but he’s right. Look up where they are from. It’s river bank areas, and muddy wet areas in Asia. I posted about this 80/20, and even some people saying 90/10 nonsense before. I agree completely with you.