Clownfish death

[surfisjah]

Yesterday was a sad day in our two month old tank. We lost all three of our juvenile clownfish. All other inhabitants are doing fine. Did I feed them to death? The tang, inverts, anenome, and zoas are fine. Tang was super hungry tonight. Phosphate level is a little high but everything else is perfect. The clownfish didn't look sick the just lost there ability to swim normally and then died pretty soon afterward all within 12 hours. 3/3 of them. I switched to pellet food from the fish store a couple of days back. They are the only ones that ate that food. Any ideas? Thanks