I would add 1 Tablespoon of salt (non-iodized tablesalt) for every 5 gallons of water, so about 8 Tablespoons for a 46g figuring the water displacement from gravel and décor.We kept one jack Dempsey, and the convict. The tank is MUCH more peaceful. But I think something is wrong with Ace. Is it normal for him to float like this? I think he's dying... Been doing water changes and stuff, he was even more active once we got the other fish out of there yesterday... He usually let's us pet him some, but when I pet him he doesn't swim around my wrist today... I picked him up some and he just slid downwards out of my hand and floated back up... His fins are fluttering but not much, thought he was sleeping at first but now I'm not sure... I added another bubbler to the tank, maybe too much oxygen? Is that possible?
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The ropefish, like other Polypterus actually needs to be able to surface to breathe - they have lungs as well as gills, so perhaps some fresh air might help him.....perhaps a fan blowing at the tank - is there a decent gap at the surface for him or is it completely sealed-up to keep the other eels or eel-like fish from climbing out?