[rafini]

If you are putting your fish in a bucket to do a water change you are probably changing too much water.
Just change 10-50% every 1-2 weeks and your fish should be fine!

do you have a close up showing the shape of the fishes mouth? if so that would be a good way to tell if it is a labidochromis or not.
Looks a little too light to be a rusty, my guess would also be M. Greshakei

 

[rafini]

okay thats great, sorry I didn't want to come across as mean. It's just that a lot of newcomers to the hobby think that they need to change all the tank at once, Trying to save your water bill lol.

Labidochromis typically have more pointed snouts, they are insectivorous in nature, whereas most of the other Mbuna have that typically blunt and wide mouth structure for scraping algae off of rocks.