Fritz Aquatics AFA80203 Fritzzyme 9-Saltwater Nitrifying Bacteria for Aquarium, 8-Ounce by Fritz Aquatics

Q: Does it need to be kept in the fridge? Is it shipped with ice packs?

This item does not need to be refrigerated and is not shipped with ice packs. It can be stored at room temperature.

Q: Is this the same as their Turbo Start by a different name?

It is a less concentrated solution of the same bacteria, if I recall correctly. Turbo start should be added all at once, rather than as needed over time. Turbo start also has to be kept cold, and I'm not sure Amazon will ship it that way. I like the flexibility of Fritz 9, so that is what I use.

Q: can i dump the whole bottle into 90 gal saltwater tank?

it's probably best to follow the dosage instructions !!! they allow fo multiple dosings over several days

Q: Son just got a fiddler crab, we need brackish water , will this work?

I don't know everything about brackish water, but I wouldn't think so. I thought brackish water was half salt/half fresh water. I would think you would need sea salt for that.