Lighting for a 3 foot wide, 22 inch deep tank?

[otzhorse]

Do you think one K7 V3 will be sufficient for a 36x18x21 aquarium? I found a deal on just one and need to know if it’ll work with my set up.

No you will likely need two. If I recall correctly the spread is 24x24 so you will have a lot of shadowing and the coverage on the edges will not be good. @noopsyche please clarify if I'm giving the wrong information.