the one in the op looks like looks like the one
here. these are most likely asian captive bred sb floridas and the defect is
more likely a result of inbreeding, compared to solomon's sb spotted gar(wc parents), which is likely the result of a genetic anomality. hence the deformed looking tail. however, i also remember very recently seeing a fl gar in a lfs with similiar injuries on the anal and cadual fins. leads me to suspect this may possibly be an old injury on top of being sb. obviously the fish is also a little overfed, which is what usually happens to sb fish to achieve the "fat & cute" result(that i personally find extremely distasteful). also the op has told me that prior to this the gar has was kept in an even larger tank(it's currently in a 180g i believe). furthermore, ime gars don't stunt in this way. in response to too small a tank, (and often as a result-) poor water conditions, gars reduce growth. obviously this has long standing effects on the fishes health and ultimately its lifespan, but i've not known a gar to become obease looking due to stunting.