Lighting to highlight fish without encouraging algae
I have a medium-planted 24" cube low-tech tank with a single Finnex Planted+ for light. The plants (java ferns, java moss, mixed crypts, anubias, water sprite, water lettuce) all seem to be doing well enough in the lowish light it provides, and 8 months in I'm managing to keep the algae mostly in check, which is a first for me.
But my fish (guppies, glowlight tetras and a dwarf neon gourami) are not looking their best unless they happen to be in certain spots near the top underneath the light strip. Is there a clever way I can add more light (perhaps of a specific colour?) to help bring out the best in the fish without just cranking up the light and encouraging the dreaded algae to flourish? Or is this just something where I have to decide to live withe the consequences of low-tech?