Silver acting strange

[asder112]

Hi guys -

I have an ~18inch silver in a 135 gallon tank with a ~9inch pike cichlid. Prior to this posting the silver hadn't shown the slightest interest in any food I had offered whatsoever for at least a month. I've heard this was normal so I wasn't too worried about it. However, I did a water change yesterday and the silver has started to open and close its mouth in tune to its gills moving. Before the water change I had never seen him doing this. I'm just worried that something might be wrong (since he also isn;t eating). Do any of you guys know if somethign is wrong? Everything else on the silver appears normal.

THanks!

 

[hmoobvwj]

Hmmmmm water parameters could help.

 

[Red Devil]

my silver on occasion goes around his tank acting more like a lion or tiger then an arow.. he waves his head and opens and closes his mouth...almost like he is contemplating an attack on something imaginary... they can go easily 6- 8 weeks on these fasts they have every so often.. but sometimes you can break their fast by adding a couple live crickets ... i know you don't want him to get back into live food.. at least i didn't but those two crickets mine ate seemed to stimulate his appetite and the fast was over.... i hope your guy is just play acting like mine was...