Huapala they do but if you use pond sealer or other non toxic concrete sealer and seal the entire thing with 3 or 4 coats it wont leach into your tank
Other suggestions are perhaps going witha canister filter rather than the HOB. An Eheim 2213 or 2215. And Aeration..although if you stick with the
well for some reason my nitrates dropped off pretty significantly today
More photos of driftwood if interested. Pieces are currently in tank. Not sure on driftwood prices. Entertaining offers.
Exo Terra Silk Plant ... bought for use in aquarium, as was used at aquarium store. Hidden suction cup on back. One Large - 25" One Small - 15".