I'm afraid the Grouper and the puffer will eat any critter they can fit in their very large mouths. 90g...I know it sounds large (I have a 90g too) it's actually a medium sized Saltwater tank (more on the small side), your fish choices are going to way outgrow such a tank..I have a 90 gallon tank, the puffer has already eaten a clown fish and has been in the tank almost a month,
Thank you so much!!I'm afraid the Grouper and the puffer will eat any critter they can fit in their very large mouths. 90g...I know it sounds large (I have a 90g too) it's actually a medium sized Saltwater tank (more on the small side), your fish choices are going to way outgrow such a tank..