[species8472uk1]

in my last tank they kept opening and closing there mouths
in the new bigger tank ..done today they keep em shut?....why that..

i have 2 new powerheads??

 

[dan-uk]

When the piranha is doing this all he is doing is streching his jaw muscles it is totally normal.There maybe times where he goes long periods of time without doing it.

 

[species8472uk1]

thanks