I doubt it.
HITH takes a while to develop and tannins from drift wood have never been attributed to it that i know of.
Poor filtration, boring diet and poor water conditions are what cause it.
Check all those things.
- You should be filtering 5X the volume of your tank per hour if you have a canister.
If you dont have a canister, you should be turning over 10X the volume per hour.
- Nitrates shouldnt be over 80 for long periods of time.
- Diet should consist of a variety of foods and not just pellets. A boring diet is one of the main causes of HITH in Oscars. As treatment and maintenance, i would add some sort of Vitamin supplement to the diet like Vita-Chem. Variety should include veggies, meaty foods, insects, krill, worms etc.