Even if you do know people like that, those people aren't the whole population of owners. Those could easily be just the odd cases of them growing larger then normal in the home aquarium
I happen to know people who have them that are much larger than 10 inches, closer to 18-20 inches. So...no. Not buying it.
if you find a Senegal poly that hits 9 inches you're lucky....there are very few polys that hit 20 inches that are readily available.Your bichir worries me, a potential 20 inch fish in a 55g, that's pretty big. 3 BNs, hmm, a pair will likely form & breed, snacks for syno & bichir...except for those pectoral spines that may cause issues.
senegals? get a pic of them, and ask them were they purchased them because the ONLY way those are senegals is if they are straight out of African waters.I happen to know people who have them that are much larger than 10 inches, closer to 18-20 inches. So...no. Not buying it.
Senegals are the most inbred, overproduced poly on the market with dels and ornates pulling in a close 2nd. Their genetics don't allow them to grow more than 9-10 inches in home aquaria most of the time. a 15" fish is either a F1 generation or wild caught.I actually just read on fish base that the largest P. senegalus on record was 70 cm (27.56 inches). But I've never seen one more than 10 inches in the hobby. Mine was 8 inches when I rehomed him, long story, but I do miss him. He was my favourite fish, even if he did always eat his friends. In 6 months he went from 2 inches to 4 or 5. Then he slowed down a lot. They're very long lived fish (upwards of 30 years) which means they grow kind of slow. Fish grow their entire lives, so what I think happens with some of these species is the stuff that comes along with living in a box shortens their life. No matter how pristine we keep our water or how much variety of food we offer, there is something missing. Of course there are times when it is the opposite and they live much longer in captivity than they do in the wild. But I think the former is the reason why we don't see those 27 inch P. senegalus in the hobby,