If you built tunnels out of pvc pipe, how would you tell if a fish died?

well if you dont see the fish for a few days you would pull its up and check but if you had a pair of fish that were acting a bit funny i wouldn't check for a few more days just incase they were breeding




300th post yay
 
My lfs suggested pvc for tunnels but my hubby wanted something clear. His solution- glass hurricane shade(as in candle holder). My nics and pacus seem to love it. They used to fight over my caves all the time. I just hope they don't break it...
 
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