humm, have you considered adding wood to the tank, if you don't boil it before adding, you will get tea-colored water which some people like and consider natural to some fish. The tannins will leech out of the wood and tints the water. Just an alternative idea to lighting changes. hth
I accidentally got some duck weed in on a plant order and it is just perfect for fine tuning the light in the tank. It floats and reproduces really easily (I think it just divides on its own). It is like a floating little garden on top and the light diffusing through it is very pretty, and can be quite dim. When it gets too dark, you just scoop out what you don't want (you can put it in another tank, but honestly, mine is so prolific that I end up throwing a lot of it away )
Just a thought
Yep, totally non plant. I supplement for the silver dollars. Floating duckweed is a good idea. But I still bet I need strong lighting even for that.
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