The crabs are spider crabs 2.5 cm across fully grown, found in a colony on the fresh water side of a esturary, bred through several generations to now thrive in freshwater rather than brackish and they are doing awsome btw
they are in there to clean up the dead shrimp and plant matter which they do well
true Siamese algae eaters-its a big tank and they are disposable im not worried
fighters, bettas and yes i did my research and talked to quite a few betta guys, i managed to get a very submissive male with a harem of 4 submissive females, again big tank, heavily planted lots of cover and monitored, and they are lazy, often swimming as a group, i won the lotto for now lol
the shrimp are in there as food/scavengers if they wernt being eaten they arnt doing their job right, again lots of cover ect....
ON TOPIC THO is the situation of my plants being eaten not my shrimp and by a cat not a crab