Ive used miniflakes, reefflakes and now mesoflakes. I like the meso, as its big enough to not blow around with the flow cranked up, but still thin enough to let my wrasses dive into it. Premiumaquatics used to have a sampler pack for like $3 (I dont see it on the site now though) where you could get small (1oz or so) of all of the different grades of sand to compare them. Might be worth an email to see if they have them still. Anyhow, I found that the miniflakes blew around quite a bit, I dont have those issues with the mesoflakes so far - and I have the WAVs set at 60% on Mavericks. Here's some pictures of the grain size compared with the derasa that I have in there (about 2.5" across). I used 60lbs in my 525xL.