nice tank!
re: wooden floor support, generally no.
you need to reinforce the floors for that much concentrated weight.
most MFKer's seem to reinforce their flooring for pretty much 150g and up.
once you get to this size, you are looking at the weight of some small cars, sitting in one spot for years and years..so it can be an issue of sagging over time unless the flooring is beefed up.