How to top off a tank with a snowflake eel

[Porcupine Reefer]

This freak accident happened to me a long time ago. One night I was topping off my tank with new water; the snowflake eel I had was sitting on one of the rocks, and I did see the new water being converted around him, before this night, the eel was just fine when I topped off the tank in the past so I didn't feel concerned about it. later on the next day I came down stairs, and then saw the eel floating at the surface and his stomach was bloated and discolored, I did see bubbles in its stomach so he did get gas bubble disease. The eel died that same day and I never got one since; but I thought about getting another one recently. how do I avoid this tragedy from happening again, and what do I need to do to prevent gas bubble disease for eels?

 

[tbrown]

How often were you topping off? It would probably be better to do frequent small top offs with an Auto Top Off rather than a larger one every day or two.

Another option could be to take something like a feeding tube down into the water column a little more, top off into that slowly. Add a small powerhead or return pump to mix the water like a reaction chamber so it doesn't push straight RO water.

 

[Üter]

I top off the sump, not the display.