I bought a new bird feeder,a cage tube type and filled it with black oil sunflower seeds.I'm hoping to attract Cardinals and Gold Finches and any song bird.It's been out in my front yard near my wife's zinnias for a week now and has not drawn any birds .I'm very puzzled and have been researching colors that attract birds.It's bright yellow and was wondering if that's the problem?It's a metal feeder powder coated yellow,I could paint it green as I seen that's a color most birds like but would like some of your opinions on what to do.