Motoro size and tank size?

I know motoros can reach almost 3' (disc size), but I was wondering how many specimens are actually getting close to that size?
I have very rarely seen photos of aquarium motoros much bigger than 24" in disc size.
So to all Motoro owners, how would you analyze the growth of your rays after they hit 24"? Slow? Very slow?
Are they usually stopping at around 24" when captive?

I'm an owner of 2 motoros, larger one around 12". This is the indoor pond I will be building, sadly cant be 4' all the way across, car needs to be able to fit into the garage.
Very bad drawing of the plans...



Won't this be sufficient for a very long time?

MHDevelopments said:

That size will be sufficient for quite some time yes. Make sure you have PLENTY of flow because the irregular shape may lead to dead spots in the tank at the narrow end which may allow crap to accumulate and cause trouble for the water chemistry


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There will be plenty of filtration and water circulation will be more than sufficient.