Good write-up! Thanks for sharing your experience.
Yeah, green water is one of those algae types that can be difficult get rid off when it appears. Interestingly, it can also be a challenge to generate and sustain when you actually need it (ie. to feed fry or filter feeders).
Personally, i run a green water culture tank outdoors under direct sunlight and have to load it with crazy amounts of raw nutrients (aka aquarium waste) and fertilizers in order to keep the green water alive. If i forget to replenish the waste and ferts, or if the weather turns rainy/cloudy with less sunlight for a few days, i notice the green water will start to die off and clear up. So they do really need constant strong lights and lots of nutrients to keep alive.
Just an idea to consider, if you notice green water appearing again... perhaps you could consider adding one or two filter feeders like clams, fan shrimps or even daphnia (if you're not keeping any small fishes), they will relish the green water as a food source and you'll get to keep another interesting livestock in the tank. It could go some ways into creating a self-sustaining symbiotic system.
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