Adding Sand

My 90g is up and running now for a couple months. I was thinking of running it bare bottom but was given a bag of Tropic Eden mesoflakes. So I'm probably going to add this along with the dry sand from my classroom tank I had to break down. I've thoroughly rinsed both with tap water and will do a final rinse in rodi. Will there be any I'll effects to adding this to my tank. Currently a pair of clownfish and 6 hammers and torches in the tank.