• Mike

Chad

What is the volume of the aquarium? Usually, if it's not an injury and the fish has lost control of its buoyancy, the reason is one: dysfunction of the swim bladder, but it could also be a gill bacterial infection. You can also try treating for the presence of helminths; it might help.

Joseph8842

The volume is 400 liters. How and with what should I treat it, or is this dysfunction not treatable?

John3165

What is the oxygen saturation? Almost 90% waste. Here is a link, although it is about freshwater, but everything is similar, take a look.