Ask Aquariaman
Advice column all about aquariums by J. Hotelling
Subject: green water

Date: Thu, 7 Sep 2000 22:43:26 -0400

Hello, how are you? I have a 29gal tank. I am having a problem with my

water constantly turning green. I can have crystal clear water one day and

have green the next. Any tips or advise for me. I miss my crystal clear

tank, and am thinking about shutting it down. Please help.




I am well; thank you for asking. Green water is generally caused by some

excess of phosphates in the system. Phosphates are produced by some excess

of light or nutrients to the system.

1) Check your lighting. Make sure it is adequate, but not excessive. If

you are not sure, try leaving it off for most of the day. Turn it on only

for a few hours in the evening. Look for any direct light sources as well,

and remove them from the equation.

2) Check your nitrates using a test kit. They should be within normal

range. Excess nitrates may produce green water.

3) You may want to purchase a phosphate test kit (around $10) to test your


4) Reduce your feeding and look for excess food on the substrate (gravel.)

Whatever you do, don’t give up. Too many hobbyists give up too easily.

There are many reasons for this, but we highly recommend reading and using

the internet as a valuable resource for help. Feel free to ask other

questions of visit our site and send our salespeople a question. The past

thing I personally want to see is a hobbyist lost to a minor complication.

Fishkeeping is a wonderfully enjoyable hobby.

I hope this helps you out and look forward to hearing the results.



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