01-27-2011, 04:47 PM
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42 gallons is not really big enough for all those fish... I would tell him to give away a few of the goldfish and probably one of the plecos too. Goldfish and plecos are both messy eaters so feeding less is something he will need to do for sure. He might just want to stop feeding the plecos pellets all together or just feed them once a week. They will eat any extra food that the goldfish dont eat so they wont need to be fed all the time. Those filters should be doing a good job once he starts doing the things everyone has suggested. Do smaller water changes, feed less, dont clean both filters at the same time, and make sure to use water conditioner and everything should sort itself out.