Creating dwarf RTC

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Basically going against the laws of nature by creating hybrids which are manmade. No species should breed with another entirely different species naturally, this just creates a genetically mutated fish which may have a shorter lifespan, mutated body parts etc. it should just be one purebred species.
In the wild, you would never see a redtail x paroon shark hybrid.
Similarly, hybrid cichlids, such as flowerhorns and blood parrots, often suffer from bone and organ deformities and exhibit unnatural levels of aggression.
 
It just...isn't a good idea, to put it lightly, and shows a lack of foresight and insight into the topic (as you've already admitted).
Trans-familial hybrids are incredibly improbable and it is still somewhat unknown (the information isn't readily available to the public, at least) as to how the Pangasius x Phractocephalus hybrids occur; said hybrids look miserable and have an incredibly fragile, short lifespan anyhow. In no sane world would crossing a mochokid and a pimelodid result in merely a smaller pimelodid with smaller physical attributes, too.
External artificial semination of stripped eggs also isn't a possibility with a large number of species- almost certainly not with tiny Synodontis.
 
If you want a pocket RTC, you're better off looking into mid-size catfish that resemble it in body shape and behavior. Sun cats, lancers, bumblebee cats (both Asian and SA; former is more colorful, latter is closer in body form), gulpers, Chrysichthys ornatus or assorted pims will scratch that itch in a more modest (<125g) tank. If it's the showy tail you're after, consider getting a pleco like L091 or L114 and growing it to full size.

As more experienced members also said, even robust hybrids between species in the same genus are subject to deformities and potentially shortened lifespans. Trying it with a pimelodid and a mochokid is asking for a lot of dead embryos and a handful of fish in perpetual agony, that will most likely pass before they're a year old.
 
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