When I had my cichlids in a 55g they were extremely skittish and shy. You would think the tank was empty it was that bad. I recently upped them to a 125g and they were a little better. Only recently has the problem been resolved when I added 10 new fish. They now act like they once did swimming out front and rushing for food when I get near.
I think my issue was that I had a friend come over who apparently tormented the fish with a mag float and his phone, while I wasn't there. Since that incident they were horribly shy. I'm so glad I got my fish back nbut it took weeks.
180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18