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Discussion Starter · #1 ·
Just set up my brand new xP4 for about a month and 1st 3 weeks was just for fishless cycle and the last 1 week had only 1 5" oscar in it and now the inlet and outlet tubing is covered with spots of black stuff.
Anyone knows what is the problem?

Thanks.
ps. xP4 is in a 135g tank with 2 AquaClear 110.
 
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