Oak is pretty easy to recognize. :) Just look for a tree with those leaves.
It is pretty rare where I live, so you may not be able to find it. o-O You can always research on other websites for other safe trees.
I looked up native trees in my state [RI, USA], and came up with these results:
Bitter-nut-hickory, white elm, slippery elm, butternut, chestnut, rock maple, red maple, white maple, black birch, canoe birch, gray birch, yellow birch, and a whole bunch of others.
What would be the best recommended tree-parts. If there are no native recommended parts, if I obtain parts of a species, what do I do to make it safe for the betta's?
Sticks, soak them in water for a few weeks. Youll have to change the water every now and then, until it stops turning the water brown. Dong boil rocks. Scrub them really well with vinegar and water. Rocks can alter hardness and pH, as can leaves and twigs. You'll have to monitor this.
I have not moved the tank around, but, I just want to double check that they wont end up slaughtering each other, hence why i asked. Previous posters say that the tank was too small[which i knew, but, the betta's didn't really seem to care]. I honestly think that the larger female went Piranha on the others because the tank looked the same as it was originally, when she was in it alone with 4 cories and two african dwarf frogs.
Just to note; I DID have 4 corydoras in there, aswell as two frogs, but. They died. Now, only 2 remain. They died due to underfeeding, since, they were never able to find the food, even when I put it right infront of them.
Im about to change the scenery around a bit, and since the tank just had a 100% water change, i doubt it'll be cloudy during the movement.