my black shark is in ph shock

[Angel Lady]

my ph dropped for no reason and it changed my shark and pleco's color and now the shark is acting funny swimming upside down athe pleco is swimming real slow can someone tell me what to do and also tell my how to keep this from happening again

 

[sgtbirch]

I think I read somewhere black sharks sometimes swim upside down. helps them to breathe better

 

[Angel Lady]

my tank is in a mini cycle so that explains the reason for the sudden ph drop