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NFC: Adopt-A-Tank help needed on blue green algae, overfeeding

My Adopt-A-Tank at the library still has what I believe to be a Blue-Green 
algae problem.  I've done weekly 50% water changes, added no fertilizer, 
thrown away infected plants and it comes right back.  Saturday I did a 60% 
water change and cleaned all the glass; by yesterday afternoon it had grown 
back three inches up the side of the tank and is now growing on the gravel.  
Lots of plants are doing great and I don't think having six fish in a 29 
gallon aquarium to have too large of a bio-load.

As I understand it, Blue-Green Algae is actually a bacteria infestation of 
some sort.  Guess I will have to resort to some sort of antibiotic.  
Suggestion needed and appreciated.

One of the reasons I suspect it has not been yet contained is that I suspect 
the staff is overfeeding the fish.  One of the reasons I think they do this 
is they are afraid the single darter is not able to compete with the larger 
and quicker other natives for the food.  Guess I will have to threaten them 
with Robert Rice's suggestion of only feeding the fish twice a week.  

Chuck Church
Indianapolis, Indiana USA