Posted from bettysplendens.comCaudal: In all three PK types the spread of the caudal ideally should be 180 degrees but the differences lie in the shape and branching of the rays. The caudal of (asymmetrical) traditional PKs is allowed to be rounded or spade-shaped. In my personal opinion the ideal (asymmetrical) traditional PK should have a primary (2-ray) branching. According to the IBC standard both a primary as a secondary (4-ray) branching are allowed. The spread in the caudal is not caused by an increase of branching but by an increase of webbing between the rays. The caudal of both asymmetrical show PKs and symmetrical PKs have straight rays, sharp edges and the shape of a semi-circle (capital "D"). The rays in the caudal often have a secondary branching (4-ray) or more (but should not be excessive). A >180 degree spread (overhalfmoon, oHM) is not preferred above a 180 degree spread. Here, the caudal should be no longer than 1/3 of the body.
What that means is ideally any quality plakat should have a 180 degree spread.
But in the traditional (non half moon) the edges of the tail are allowed to be shaped in something other than a complete half circle.
Hopefully that makes sense.
The only reason I mention any of this is $30 seems high for a fish that doesn't actually present as labelled.
If you like the fish, that's great, pay whatever amount you're willing to get it. But if you are specifically looking for a half moon, I wouldn't pay that for one that's not.