04-02-2012, 03:57 PM
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Fish should always appear hungry, so resist the temptation to overfeed. Upper fish (eating floating flake/pellet) should finish what you feed them in a minute or less. If they are still eating after that, they are being overfed. Substrate fish are a bit different, they naturally sit and nibble on sinking foods.
Missing a day, even alternate day feedings, will not hurt mature healthy fish. Fry need more frequent feedings, but not mature fish.
I'm not aware of the connection with the curved spine and overfeeding, so can't say this is the problem. But feeding less won't hurt nonetheless.
And, welcome to Tropical Fish Keeping forum.