Bandi Posted October 16, 2015 Report Share Posted October 16, 2015 I have a 180 gallon with sand substrate run by an FX5. When I do water changes and stir up the sand there are thousands of 1cm long worms about half the width of sewing thread floating EVERYWHERE. fish are large waking cat, big front, oscar, true parrot and a parachromis sp. all seen fine. Should I be worried? Quote Link to comment Share on other sites More sharing options...
Roshi Posted October 16, 2015 Report Share Posted October 16, 2015 (edited) Those are probably harmless nematodes/detritus worm. Usually grows when tank is fed too much. Edited October 16, 2015 by Roshi Quote Link to comment Share on other sites More sharing options...
Bandi Posted October 16, 2015 Author Report Share Posted October 16, 2015 Are they harmful? The cat fish is very messy and eats a lot. So what you said makes sense. Quote Link to comment Share on other sites More sharing options...
Roshi Posted October 16, 2015 Report Share Posted October 16, 2015 Nope, theyre completely harmless. Quote Link to comment Share on other sites More sharing options...
FunkSolid Posted October 18, 2015 Report Share Posted October 18, 2015 I usually see them when I kick my canisters back on after a water change. My rainbows love them, and to my knowledge they are harmless. Quote Link to comment Share on other sites More sharing options...
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