I hope you clean their water once or more a day as their toxins can be dangerous to themselves if not properly taken care of.
This statement is incorrect. 1) The animals dont release their toxin, if they are not attacked and can well distinguish between predators and their own species.
2) The toxin (Bombesin, which is btw a 14-Amino Acid Peptide, which has probably no long halflife time outside the animal) is not toxic to the animals, this would not make any reason. To be exakt b.orientalis has three different kind Bombesin as published some years ago.
It is perfectly good to change the water, especially when a group of animals is housed, but please don´t give wrong statements about animals toxicating themselves.
See you
Uwe