Its up to u whether to keep the pig, but u have to be careful of the polyresin decor (tree roots). i used to have a 12in endli & 10in del but they died 2~3 days later after i add the decor which looks exactly the same as urs. my other fishs (10in oscar & 4in rainbow shark) were not affected.
PIG = CHEESE
Why not put a plastic diver or shark in there to go with the look .
Sorry keep the pig if you like it it's your tank you should do what you like .
Mayalasian Driftwood will work fine just as long as you soak it for a week or two. So you can minimize the amount of tannins released in the water. Will change water color a little but nothing water changes cannot fix. That is all I use in my tank with polys.
Malaysian driftwood will leach a lot. Like BichirAddict said, soak it for a few weeks to reduce the amount of tannins that will leach in you tank (it will continue to leach for months just not as much)...and lose the pig.