Ok once again I'm trying a planted tank the tank has been running for about 5 years. 3 weeks ago tore it down saved most of the water left a dirty filter took out the rocks and gravel substrate. I added all new substrate about 1.5-2" of flourite and about 1-1.5 inches of silica sand, and I am aware the flouite will eventually push it's way up and mix. I have read a few articles where people did the exact same substrate and thats the only way they do it.....I talked to the plant guy at a LFS and he tells me it doesn't work better to have gravel on top for various reasons. I trolled around the interweeb and read why it is bad...crushed roots build up of gases...etc
Just curious is anyone else is running this substrate? What are the experiences? Good? Bad?