West1, I'll take care of you and we can talk and try this again.
Personal experience. I've had these 10 years ago, and on and off in the past 6 years, never lost a single one of them, these are rather hardy.
Neoprodigy had a group he kept in tupperwares on a drip system, feeding fish pellet sticks for years, and they were bright yellow colored.
Conductivity may be stripped if you're using pothos in your tank and possibly the lack of coral sand, as compared to mine, which may have sent it into shock. Until we rectify this, we cannot keep them again.
This is what I wrote to DB junkie on an email: The exact collection point on these fish will always be a mystery. Indonesia a country, scattered with thousands of islands, and many of the islands hold pockets of inland salt water lakes, or freshwater water bodies that hold salt water fish. There are sharks, dolphins, jelly fish, sawfish that are found in complete freshwater. Likewise the origin of these eels.
There is no science stating that fish need to move to salt water at a certain stage in life, if they are eating great and living months like they are in your tank, as long as you don't do something to introduce disease or disrupt their current conditions, they should live long and happy.
Do you remember the recent discovery of all those shrimps from Sulawesi? All the fish and shrimps from the lakes resemble salt water animals, matter of fact, they have freshwater sponges in the lake. I can write an entire book supporting these theories, and its difficult to explain it sometimes. There are also landlocked manmade damns in Australia that hold saltwater fish that reproduce and thrive in them.