but you havent explained potential?
why will some grow 6 inches+ bigger than others? mine were all kept in a large tank, well fed, well maintained and they all grew to about 9-10 inches. (adult size)
i dont understand why/how others will grow 50% larger again? its not like mine were limited in food, growth, space, effected by tank mates etc.
commons are very different, you entering dangerous waters there. Many many subspecies make up the 'common pleco' species, hence the large variation in sizes/colour/makings/behaviour and often they are just sold under one bracket. It would be like using an overarching statement for all the panaque species.
we are just talking about one species here, the L191.
That is probably one of the most unexplained questions in history lol, why don't all human grow the same size?, why don't all same species dogs grow the same size?. They just don't and that's the only true answer that can be given as any type of explanation. Genetics is probably the main reason, well it would work for any living creature in that case. Just becasue my sister is 5.2 doesnt mean that my other sister HAS to get the same size or theres is a problem becasue my other sister is 5.10.
I didn't say there wasn't different kind of common plecs lol, but the 'run of the mill' commons that are usually sold in shops are pretty much from the same genus apart from gibbi's and L001 gold spots which are pretty much distinct from one another regarding pattern and so forth.
The comparison was for two of the same fish not different species/sub species. For instance to make it clearer, to L001 gold spots put in identical suitable tanks, same water stats, same decor, same foods and i guarantee they will not reach the same size ...either at the same time nor over the full lifetime.
Potential is given to a fish that MAY get to this size, a fish that HAS got to this size reported and will POTENTIALLY get to this size again with another person keeping it. Doesn't mean that becasue one fish has gotten to 16 inches the next fish will but giving the potential size is always what should be given just incase. That to me makes more sense.
I could go on and on about how a fish size can differ... and by asking why does this fish get to this but but same fish didn't isn't logical nor can really be given an answer to.
Do you think every fish in the wild is the same size at the same age?, if your answer is no then why ask this question here?, it just doesn't make sense.
Just to clarify, royals like most other plecs will live in excess of 20 years, how can you say your fish is fully grown at 8- 10 inches when it will continue to grow given the right conditions probably all it's life. Just becasue it got to 8-10 inches and seem to have stop growing but infact just slowed down considerably, doesn't mean that in the next 10 years it wouldn't have grown another 4 inches reaching the POTENTIAL size which ive tried to explain.