[APD] piranha not feeding

["James Hogan" <spree_rider at hotmail_com>]

my piranha are not feeding, they eat about one bite of beef heart or shrimp 
then stop.  they are starting to get skinny and i am getting worrid about 
them.  they are about 1.5 years old and 4' long.  the water is high in 
phosphate but the ph is stable at 6.8.  the tank has been properly cycled 
and all other water paramiters have been met.  this is a planted tank 38 
gallon with 3 fish with lower lighting only about .5 watts/gallon.  they 
swim around when nobody is around but hide when watched.  even when alone 
and active they don't feed much? does anyone know what i can do to get them 
to eat more?  i occasionaly give them goldfish as live food.  i quarintien 
these for one month before feeding.
anyhelp would be greatly appreciated
and thankyou to everyone who has helped me in the past from this mailing 
list you have been most helpfull.

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