I'm considering adding a bit more action to my 125 l. So far there's 10 pentazona barbs and 12 glowlight danios. I quite fancy a small shoal of zebra danios, 6 or so. They'll add some interest to the upper levels and are very active, providing a nice contrast to the serene planting style (crypts, ferns, anubias). Tank temp is set to around 25C. Plenty of flow via 600lph Juwel internal filter (single nozzle, no spray bar.) Any thoughts welcome.