The regular blues are darker with spangling resembling a Dempsey or Gt. I actually didn't know until recently the EBAs are a hybrid crossed with blue rams. I just thought they were line bred for color. From doing a bit of research the regular blues used to be common in LFS but are hard to find now. BA's can get up to 8 inches. My biggest EBA was Rocky at 7 inches and still young.
the blue acara
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the electric blue acara
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blue ram cichlid
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some information I verified at other sites and consistent with my experience.
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Talking about this helps some. For people wanting an EBA I'll only say they're energetic, personable and intelligent fish. Not a dud personality anywhere. But know what you're getting into long term and be prepared. They are champion jumpers and will escape closed lids often hurling themselves several feet away. Hollow bellies and infections can appear suddenly after adulthood and you'll be on a merry-go-round of improvement and decline. I've had 4, and 3 of them went through this cycle (lost one to multiple jumping).
I can't even say the EBA look 'better' than the BA, they're stunning fish. I don't get it. But as much as I love the EBA I'm not putting myself through this anymore. Once is a fluke, three a pattern.