Ok so going on from my initial string of questions.

Unfortunately we have had to move the Snowflake Moray Eel (Echidna nebulosa) because the Bamboo Sharks had been battering him like crazy over the easter period to the point where his tail was just dark red because of the repetitive attacks from the sharks.

As it is though I have noticed that whilst the Moray was in the tank the sharks almost constantly seemed to have very red patches on their bellies however since the moray has gone the sharks seem to be much happier, they are eating perfectly, there have been no signs of the redness on their bellies.

The question is this: is there any chance that the Moray was stressing the sharks?