Dead slug poisionous?

I had a very bright purple with a orange tipped tenticals on the front and an orange tipped "anenome" looking tenticals in the back. He managed to squeeze inbetween the sponge and inlet on my powerhead and died. I have no clue how long he was there but was dead when i found him. Do i need to take my fish out??? Will he have poisioned the water??? Do a good water change???

 

Heres a pick

 

Did a 5 gal change out of 55. Fish are behaving fine ill keep a close eye

 

What are your parameters?

 

thats a beautiful nudibranch , or at least thats what i think it is. lol. pagojoe could probably identify it and whether its a toxic variety.

 

I had one similar to it. I havent seen it in a few months so i dont know if it is dead or not but havent seen any ill effects if it is dead.

 

Water quality is top notch across the board thats why i only did a 5 gal change.