If there is a poison or toxic stuff in the tank, how long until you can tell?

[needcash]

Lets say you used a glue to fix leak or somthing, how long before you think you could tell if it was toxic to the fish? right away? 1 day? 1 week? 1 month?

also, when using a "glue", what ingrediants should you stay away from?

Anyone here ever use "goop marine"? is it ok?

 

[OrionGirl]

Depends on what the toxin is--some will be immediate, others will take a while to build up enoug to impair organ function. Generally, if it's not stated as being aquarium safe, it shouldn't be assumed that it's okay.