we need an article on toxic critters

Anenomes can be harmful...Hammer Coral I've heard....Lion fish

Toxic to humans or fish?

I will go first. The first thing that comes to my mind is the

“Boxfish”

Also know as cofferfishes, cowfishes and trunkfishes. “The hexagonal plate-like scales of these fish are fused together into a solid, triangular, box-like carapace, from which the fins and tail protrude. Young boxfishes have a more rounded in shape and may exhibit bright colors. Because of their body scale structure, boxfishes are limited to slow movements. Boxfish are edible, and are sometimes baked in their own shells. In the aquaria, boxfish generally are very personable fish yet are poorly suited for the home aquaria. They are not thought of as an ordinary aquarium tank mate, but are quickly gaining popularity. They do pose a hazard in the community tank however. They are capable of releasing a very powerful toxin which can kill other fish and in some cases, the boxfish itself. They generally only use it when threatened or dying, but can become disturbed easily with aggressive tank mates or overcrowded aquarium” (Wikipedia).

Lions, scorpionfish, etc., as well as the foxface lo are poisonous.

Sea Apple Cucumber is a reallly nicely species, which actually resembles a red apple when not open. They are really good for a clean up crew but extreamly toxic to have in an aquarium. "...release holothurin and holotoxin, which can be released after death as well...Genus Pseudocolochirus are among the most poisonous of all sea cucumbers! Be aware too that when Sea Apples spawn their eggs, this can be fatal to all the fish in an aquarium as well!" (About).

alot of your soft corals are highly toxic not only to other corals but to humans and domestic animals as well ,when keeping aggrsive corals it is wize to run a carbon filtration on your system the will help reduce the amount of toxins spread during chemical warfare between species which can eventualy poising your tank..as for human and domestic animal warnings after handling the creatures wash hands thoroughly to avoid accidental injestion .which can be a very bad thing and to some even life threatening.zoas and palis are of the most toxic ..when doing water changes be sure pets do not injest this water in which corals have been in this can be fatal to your dog or cats.. as for one of the best web sites for this information i use
http://www.wetwebmedia.com/index.html

this site covers not only marine life but just about any type of aquatic life known to hobbiest

when i visited Clark University last weekend for science day, i walked in on a class and the professeur is a chemist who teaches about marine toxins and she talked all about tetratoxins (like puffers) and paly toxins (from palythoas and such). it sounded like a really really interesting class.
anways, for many types of toxins and such that arent deadly such as a lionfish sting, one of the best things you can do is put it under really hot water and also use a hairdryer (careful not to electrecute yourself. this is why i recomend one or the other. haha). But the heat will denature the enzymes (poisons) so they are no longer the same chemical formula and will not affect your body the same way.
almost all corals are toxic to eachother, but few will actualy release a lot of them into the water collum. as mentioned, leathers will often do this, which is why most people with mixed reefs who have leathers and sps run a lot of carbon, and also huge skimmers (besides for having sps)
but i have a chem quiz tomorrow, ill be back with some more later