Shy koi

[Jeremy Wheaton]

Hey everyone, I've got an off the wall question. I have a 100G stock tank that i Have 5 koi and 2 goldfish in. They are quite shy and its kid of bumming me out. The only time I see them is when I feed them, however, I have to hide behind my grow bed to do so. If they see me they dive for the bottom and hang out in some 6" PVC cut offs i put in there for shelter. I suppose I should be happy they are eating and appear to be healthy when I do catch a glimpse of them. the water levels are ideal also. I dont want to remove their shelter just for my own viewing pleasure.

Is this normal? Thanks for any input.