i have a customer that has a compacted clay soil that is a light greenish/blue tint. it is in a new development with not the best soil. i am just starting this yard this year. any suggestions or ideas on what it needs or why it is that color? also, he has i lot of bentgrass mixed into his front yard. if you kill that off with round up and plant tall fescue will the bentgrass stay away?...not much experience reseeding.