They're distinct species that don't really look all that similar once you've seen pictures of both.How can you tell the difference between bolivian and gbr?
I don't have enough experience with GBRs to feel confident in stating that their eyes are always red, but I can't recall ever seeing one without red eyes.I'll try to borrow my daughter's camera tonight and post pictures. I purchased GBRs, but noticed that this pair is very different in the face and eye coloring. My previous rams always had red coloring in their eyes and the slope of the face is somehow different.
The only way to know for certain is to examine the ventral area, between the pectoral and analfins. Look at the sexing thread linked to above for exactly what to look for.can you tell if they are male and female?