Hullo! It has been awhile, but I figure I should updated on my newest addition. I just today added a arothron dog-faced puffer to my 75. He is about 5 inches and is pretty cool. He looks great, but I have been noticing that he likes to nip alot. Not really at fish but just at random things in the aquarium like my skimmers tubing and my heater. I don't want him to electrocute himself or ruin my skimmer so is there anything out there like guards I can put over them. Some sites would be nice.