HELP!:my pleco has lost some coler and his fins have red spot's on the edges!

what!!!! two common plecs in a ten gal? with a gold fish? Ammonia!!!! i bet those are ammonia burns you are seeing. get a bigger tank, rehome both plecs and goldfish or try and fight this with daily wcs...but IMO waste of time and money. common plecs are poop machines!!!! a common plec would only fare well in probably 100gal *grow out* or more...
 
do you you really want to know why i changed the size of my goldfish?well,here it is.....i honestly thought that my goldfish was six inches.About a half an hour after i wrote the post i went back to my tank to check the size of my goldfish,this time with a ruler,and found out that what my memory of his size was was wwwwwwwaaaaaaaayyyyyyyy out of proportion from his original size,i was just embarrassed about mistaking a three inch goldfish for a six incher,satisfied?.and another thing.......my plecos are only 2 inches long,wouldn't they have to grow bigger to start experiencing stunting?,like six inches?[just making a wild guess here,going to Google the heck out of it.]. and while we are on the subject of my plecos,i would like to inform you that since i put a few leaves of lettuce underneath the plecos favorite piece of driftwood his color has almost completely returned to normal:),his practically unnoticeable listlessness has disappeared completely,and they have eaten most of it.[as soon as they finish the last of the lettuce I'm going to put some zucchini with shrimp pellets stuffed in side of it for protein in the next batch] And I'm going to put some anti ammonia chemicals and a light anti biotic,just to be safe. my crab is not aggressive.i Google d his species and read all of the results for three pages,most of them said that RCC's would get along fine in a community tank with fish that that were not smaller then half an inch ,a few said that they were killing machines,but only one said that he/she had ever actually kept one, and I'm a little suspicious of that one because he/she said that he [I'm tired of typing he/she ] had kept them with a "wide variety of fish and crustaceans",why would you try a different range of variety's of fish or invert with a critter that you know for a fact kills several variety's of them? and so far i find that the little guy is very peaceful,a good critter for a community tank. last but not least i would like to inform you that i am giving the minnows,the goldfish,and the golden dojo to a friend with a cold water tank.
 
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You may be able to keep the betta and the crab in there but those two plecos are just going to suffer. My advice is to let them go (either back to a fish store or to a friend) and get yourself a couple ottos. The growth rate of the plecos at that age should be huge. A friend of mine bought a couple at 1.5 inches and they are already over 3 and that is in two weeks. I think you and the ottos would be a much happier choice in the end.
 
Good for you for rehoming some of your fish! :) I think that it was a very responsible and humane thing to do as a fishkeeper. I agree with neon. I bought my pleco when he was about 4" long and he's now about 10" a little over a year later. You may be ok for the next month or so but after that, you'll cause permanent damage by keeping them in a tank that small. If you still want a suckermouth type fish, you could go with ottos (which I believe need to be in a school of 4 or more.) Or you could get some cories. Even though you're limited in size, you could still have a really nice tank with healthy more appropriate fish.
 
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