Python Squeeze Siphon Starter Moorish Idol Severum have an iridescent sheen

Severum have an iridescent sheen to their scales and off-white to gold background color

but this can be quite variable and it seems that no two Clown Knifefish are exactly alike

Blackstreak Surgeonfish

it requires a large aquarium of at least 125 gallons

Python Squeeze Siphon Starter Moorish Idol Severum have an iridescent sheenSqueeze Siphon Starter The Squeeze is designed for use with the Python Pro Clean Gravel Washer & Siphon Kits. This stress free siphon starter gets water flowing with a simple squeeze. It completely eliminates the need for "mouth priming" and ensures that you'll never ingest aquarium water again! Includes both 1 4" and 1 2" adapters.