Cichlid loosing color?

What are the parameters?

is this a Red Zebra or a Yellow Lab? If its a Red Zebra they can look orange or yellow in an aquarium, they can even get light enough to look as if they are turning light yellow to white.

it looks like a yellow lab but does not have the black stripe on the dorsal fin.

Click to expand...

it might be a female. reason for fading color might be = this cichlid is best maintained in groups of 5-6.

then, there's the incompatible mix of fish you've got in this tank.

Gobioides broussonnetii can grow sto over a foot and is besst maintained in brackish water (7.5 TSP of salt/ 10 gallons). your tank is not large enough to house this fish at maturity.

Corydoras are best maintained in groups of at least 4 and are decidedly NOT brackish water fish.

your Africans are best maintained in groups of 5 ... one male and four females of the same species. they need hard, alkaline water with a pH of 7.7-8.6, a hardness of 160-280 ppm and alkalinity of 180-240 ppm. this is not brackish but rather, the mineral mix consists of alot more than simply salt.