The Puffer Forum

Hello everyone, Im new to the forum as you can tell.
I have 2 green puffers and a green scat, and 1 columbian shark in the tank. It is a 10gal tank, as my bigger one just got cycled after waiting for 2 weeks. well the fish were all good with each other for the first couple of weeks. then 2 days ago I wake up and the shark was swimming with no fins, I was like wtf. Obviously he got attacked but I dont know who did it lol. So I put him in the 35gal tank to try and save him, but he died soon after. Now the Scat is attacking the puffers, both are scared of it, the gsp's are about 2" and the scat roughly the same. Im thinking, is it possible the GSP's attacked the shark, and the green scat is protecting its self from the puffers? or making them look he' know's their up to something...
I put transferred the gsp's in the 35gal now, until I decide what Im gonna do, I'll throw the scat in there too to see what happens next. Any ideas why he's acting like that?

i had a red scat in a tank with my gsp and the scat attacked him on a daily basis. had to bring the scat back to the lfs. i didnt know they were that aggressive. once again, should have done my research

The tank is much too small for those fish! The two Green Spotted Puffers along need a 60gallon tank.
It's be like putting you and two claustrophobic people in a closet together, it's not going to end well. You need to upgrade that tank as soon as you can or you're going to lose all those fish.
In my signature I have a link to my own website dedicated to the care of green spotted puffers, I highly suggest you check it out.
The very talented PufferPunk also has a fantastic article on Green Spotted Puffers in the library here.

Scats are terrible choices for most home aquariums, IMO, things grow a foot long and are nasty as anything. Maybe a group of just a few of them in a 120.