Please Help With Mudskipper Urgent

[josh63762]

hay guys please I am in need of urgent help yesterday I bought a mudskipper put him in a tank with only him and he behaved normally. now I decided to get another one I put him in about a hour ago and it is floating by his head with his fins outstretched when u touch him he reacts normally please what's wrong with him will he make it

 

[fluttermoth]

How big is your tank and how long has it been set up?

The first thing you should always do is a big water change. Switch off all your electrics and take out nearly all the water, leaving just enough to keep the fish covered, before refilling with temperature matched, dechlorinated water.

Do you know what species of mudskipper you have?