I have included some photos of both species, you can see the larger eupterus is very fat. Sorry they are a bit blurry.
We do not know what species this other, less spotted Syno is. Thanks!
![Image](http://members.cox.net/asylum23/synos%20001.jpg)
![Image](http://members.cox.net/asylum23/synos%20005.jpg)
![Image](http://members.cox.net/asylum23/synos%20007.jpg)
![Image](http://members.cox.net/asylum23/synos%20006.jpg)
![Image](http://members.cox.net/asylum23/synos%20004.jpg)
![Image](http://members.cox.net/asylum23/synos%20008.jpg)
Having syno's breed is an uncommon occurrence in itself...so you should have no worries about them crossbreedingIs it possible for the 2 different species of Synos to breed?
The most likely cause of this is being the most dominant of the three it gets first choice at the food...or maybe it has discovered the food put out for the pleco shown or maybe a spawning from other fish,but definitely keep an eye on it.There have been more than a few pictures of eupterus that look like they have swallowed a marble so it is not uncommon.He is fine now, except the pregnant looking stomach
I have been trying hard to convince myself your other two syno's are "not" hybrids but I can not do itThe other 2 I can not identify