ID these "guyanas"

[the_deeb]

I believe orbignyi grow to similar sizes as humerosas, however neither appear to really be small rays. I know someone was selling an 18"+ humerosa last year. From what I've heard, orbignyi seem to grow quite quickly as well.

 

[M|L]

one definitely looks like a hystrix

michael, you should consider wearing glasses.

they appear to be humerosas.

but could be orbignyi.

I believe humerosas have a rough sand-like texture to it's skin while the orbigyni is smooth.

 

[davo]

what is best to feed worms then if not ghost shrimp? worms?