Why does my water keep turning green?

Green water is beneficial to goldfish luckily but if you find it unsightly, then I can understand why you'd rather have the clear water. Adding some fast growing plants such as Egeria densa will help outcompete the algae for food and improve water quality. Be careful though as your oranda will find the plants rather appetizing but why not let him eat them? He at least gets a well balanced diet.:)
 
Anacharis is very old scientific name. Elodea is the next older scientific name and is still used for similar looking species. Egeria densa is the correct current scientific name for the past 20 years or so.

Pet stores use the different names for tthe same plant randomly.
 
Green water = algae bloom
Hazy water = bacterial bloom

Get a cheap UV sterilizer like "green killing machine" from Petsmart and you'll never see green water again even with the lights on 24/7.
 
Beneficial bacteria does not colonize the water column but filters and hard surfaces so UV sterilizers are fine for use although UV sterilizers aren't necessary in this particular situation either.
 
Not all the time. Green water is easy to correct in indoor tanks. Cut back on feeding, correct nutrient levels, cut back on lighting, don't overstock, encourage healthy plant growth and do many water changes.
 
Also FWIW, the bioube has a big bioball chamber in addition to the filter pad, which I assume is the part being cleaned. So I'm sure the BB isn't being rinsed away!

Also, depending on the light kit that came with it, some biocube's have a lot of light. My biocube 29 (which I assume this is) had 2x36 watts of compact fluorescent lights, and 2x36 watts of actinic, although I believe the standard is 1 of each. Some people also claim actinic lights promote algae growth. I would definitely cut the actinic for a while, it couldn't hurt anyway.
 
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