Since we are on the subject of reef friendly Eels and I’ve been contemplating searching for a compatible one..... are there any eels thy are reef friendly that will fit in a 75G?
Golden drarf gets 12" tops. Perfect for tanks down to about 30g. I kept mine in a 10g for a month with a tight lid. He was happy as can be with his caves. Caves are important! Also rocks must be secure and on the glass and it sand. They dig under the rocks and can make them unstable if they are just on sand.
Snowflake will be borderline... they get twice as big. I wouldnt put anything else in a 75...