I would suggest constructing a raised (false) floor out of untreated timber - whilst i cannot comment on your climate given I am UK based (where every day is anybody's guess) I have seen this approach used in concrete floored areas to good effect.
The only useful bit of advice I can give is avoid using ANY kind of treating products timber or otherwise, keep your environment clinical. A local chap I knew of had years of poor and failed crops which he simply could not pinpoint the cause, until he finally discovered that the linoleum he lined the garage floor with had been treated with an anti-fungal chemical, as you would expect for kitchen/bathroom flooring. It raped his ladies for years - cast it out and they thrived ever since.