it's both. the gold saum is the name of this particular color varient. there are white fin terrors as well which are silver saums. it is just a color variation, they are both green terrors
i find the black backround helps. other then that it's just a good diet. hikari staple and gold, earth worms, live tubifex worms, beef heart, and krill
i went thru the the same my 25 gallon lasted 1 month then i upgraded to 55