The tank had an outbreak of beard algae. Wasn't quite sure from where, but it did happen. Did try to take it all out, but didn't quite work. So, I got floating plants (duckweed) which brought the beard algae down to nothing. Haven't gotten a huge outbreak since. As long as the tank has floating plants covering most of the light the tank doesn't get algae blooms. The Alternanthera Reineckii 'Mini' has been moved behind the Echinodorus Quadricostatus.
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