Yes lol I have slate in both my tanks. I love it can never go back. And yes it is definitely hard to find because most lfs's label their electric blue cichlids and electric blue ahli's which is funny because a blue ahli is a sciaenochromis ahli and they don't look as cool they are more dull... If you look up sciaenochromis fryeri that is the most common cichlid that the lfs stores sell saying it is a "ahli." I personally think the s. fryeri looks better as it is way more blue and looks really nice as opposed to the dull s. ahli. Why don't you post a pic of the fish and I can try and see if it is indeed an ahli or fryeri or just look them up and see which it is
Hopefully it's an ahli its worth a lot more
Good luck.