Eek! Is My Fish Okay?

[indir-emir]

Hi everyone,
Not sure if this should go here but im paniced so its an emergency for me.

My problem is that one of my danios is being wierd. He seems to swim fine but when he sorta slows down to stop he rolls to one side or a little upright before he quickly swims and gets himself normal again, and keeps repeating the process over and over. Seems like his gonna collapse...

Also, he goes kind of skit and swims rapidly around the tank and often chases the other danios around like crazy till he decides to stop and almost rolls onto his side and just before he gets on his side he quickly swim and is back to normal.

He is eating fine, water stats are:
Ammonia = 0
Nitrite = 0
Nitrate = 20
PH = 7.6

All other fish are erfectly fine (see sig for fish (the 20gallon tank))

Any help willbe greatly appreciated

Regards,
Indir

P.S Sorry for long post

 

[WILDER]

Does he look bloated or thin.
What do you feed your fish.

 

[indir-emir]

Hey, no he is not bloating nor is he skinny. He is as he usualy is.

I feed the danios tropical flakes, sinking algae wafers to the bristlenose catfish, and sinking cichlid pellets bout 1-2mm for the rams.

Regards,
Indir

 

[WILDER]

Swimming on there sides can be swim bladder to internal parasites or a lost eye.
You need to improve the fish diet with some frozen foods like daphnia and brime strimp, and some green veg.
Cook some frozen peas for a few minutes, let cool down and pop out of shell, mush into small pieces and add to the tank.