4 bulb t5 on 90 gallon enough for high light
I have a 90 gallon 48"L 18"W 24"H with a 4 bulb t5 fixture about 8" from the surface of the water. I run two 6500k bulbs that came with the fixture (grow light fixture), 1 KZ Fiji Purple, and one Giesemann super flora.
Is this enough light to be considered high light, enough to grow dwarf hairgrass? It doesn't seem bright enough and I'm starting to think I should have went with a 6 bulb.
Anyone have experience with a 4 bulb t5 on a 90 gallon?