changing from letro the nolva???

i am taking 1.5mg of letro ED to keep my estrogen low and it is working well. i am thinking of changing to nolva to keep my estrogen down so i can run it strait through to PCT. i have been told it's not a good idea to run both of these together but will there be any problem changing from letro to nolva? and what dose of nolva is equal to 1.5mg of letro? i understand letro is much stronger so i would think about 1.5mg of letro would do the same job keeping estrogen down as sat 10mg of nolva? or should i go for 20mg? or even more? any advice is apreciated. thanks

is it true letro lower the level of estrogen in the blood but nolva only blocks it at the receptors?

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