Afraid I can’t help you with light suggestions, unless go for a light that can be adjusted infinitely, so you can get it to a level that hopefully works for plants and betta.
I’ve put a Fluval plant nano bluetooth on my 22litre (5.5 us gallons) and I am blown away by it. I get options for dawn, day, dusk and night, with 4? 5? colours, including a stunning soft warm yellow, which is much ‘kinder’ than the bright white. The inhabitants seem happy too.
Another (much cheaper) option would be to get plenty of surface/floating plants in there. A good clump of watersprite or hornwort would filter the light beautifully, remove nitrates, and provide some lovely places to loiter and lounge.
I recently cleared 3/4 of the hornwort out of the 22 litre, and Tagawa is still not happy, even though each strand grows about an inch a day. I recently read that hornwort is a good option if you have any blue-green algae sheets, because it out competes them for a certain nutrient. Just one of those little factoids that may come in useful one day.
: (Kham) mature setup; betta, purple rasboras, amano and wood shrimp. Heavily planted.
22litre cube tank
: (Tagawa); betta, 1 amano, yellow dwarf shrimp. Pond snails and 1 assassin. Heavily planted.
57litre cube tank
: ember tetras, 2 amano, 1 nerite, pond snails, 1 assassin, doing his thing. Heavily planted.
; honey gourami, cherry barbs, green neons, otocinclus, nerites, pond snails, amano. Heavily planted.
Last edited by bluesamphire; 07-29-2019 at 02:29 PM.