wierd, help please

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dpool

Feeder Fish
MFK Member
Apr 8, 2006
74
0
0
40
michigan
I took 1/2 of the water out of my tank, took some lava rock out, scooped out 4 fish, went to the lfs to sell them, came back and 3 fish are dead and 2 not doing so good, what could be the cause of this?

the 3 that are dead are 1 pleco, and 2 syno cats... so since they are bottom feeders i was thinking something chemical, but im not sure, any ideas?
 
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