I have a lot of grapewood in my 210. It will sink eventually, but it does take a while. Some pieces have grown the white fungus at first, while others never do. It doesn't rot particularly fast, I've had it for three years and it hasn't changed much, in fact I have a piece of mopani in a different tank that is rotting a lot faster.
View attachment 963140
View attachment 963141
That is grape vine I was thinking the vine type stuff for reptiles, I have 2 pieces of that in my tank, yes white crap grew on it, but after s few cleanings it looks good
Sent from my iPod touch using MonsterAquariaNetwork app