Mine got 6-7". For a 20g, only 1 full grown. I think GSs suggested stocking for a 30 is right on. Yellow labs don't eat plants like P. Salousi, but they will did them up. You could try pots. Very few Yellow lab fry survive in the main tank. If you get a brood tank for the females to spit in, they do fine. I've never known these to kill each other, but mine are in a 55. They will dig out a cave under a rock.
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