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One of the most important factors in collecting native or local items used in the tank...besides the law....is pesticides and pollution......depending on the items and the size of tank/volume of water, sensitivity of the livestock......some pesticides even in small amounts can kill everything in the tank....so care needs to be made in that regard.....and Always have fresh carbon on hand and ready to make an emergency water change if needed....but this is with anything........
Personally, I would add the wood, watch the fish and make changes as needed based on reaction of the livestock.......the white stuff is generally...IME-okay or safe in a healthy system with healthy fish and several species of fish and inverts will most likely eat the white stuff with great pleasure......the white, green, black and gray stuff that has grown on some of the native collected wood I have placed in my tanks is eaten within the first 24h by my plecos, ottos, shrimp, snails and picked on by the guppies, Bettas, tetra without any ill effects......
A couple of 55's...awesome.....what are your stocking plans......
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