green spotted/f8p and their teeth

Puffers teeth are constantly growing even from birth till the day they die. From what sounds like your past experiences, puffers teeth do not grow that long in a weeks time so you must have unawaringly bought them that way. I would suggest keeping them with small snails all the time and as a treat you could feed them Ghost Shrimp. Also what is water quality (ammonia, nitrite, nitrate, pH, salinity, temp)? This could have a big factor as to why they are dying. Anyway, hope this helps and good luck with them.

Please, nothing that fights back! =)
Just use ghost shrimp, cockles (can be found at any market that sells fresh seafood), people shrimp that's still in the shell, snails, crab's legs, dead crayfish...hmm.. I fed mine a dead fiddler crab =)
I would say the reason your puffers kept dying would be that you never cycled your tank before purchasing them, puffers are very sensitive to ammonia and nitrite. If your tank was cycled you could have had high nitrate. Generally fish don't take that long to die after being brought home if the tank is already cycled and there was a health problem. By then they should have been settled in unless there was a water quality issue. Check your puffers for illness before you buy them, check for sunken stomachs, beaks that are too long, laziness, sunken eyes and such. Puffers do not take transferring over seas very well and quite a few die in transit.

I have fed my F8P and GSP live fiddler crabs (no claws) and I see that they both nibble on the coral heads. I try to keep things as natural as posible.

Please answer cdawson's question on cycling. He is right, I agree that most immediate deaths of puffers are due to putting them into uncycled tanks.

What kind of filter do you have? Do you know about the Nitrogen Cycle? If not here is a quick summary, if you do you can ignore this. When a fish produces waste it will sit in the water. But once there is some biological bacteria in your filter it can take the waste out of the water and convert it to less toxic chemicals. The process takes the waste which is ammonia and converts it to nitrite (both ammonia and nitrite are very toxic) which then gets converted to nitrate (which is much less toxic). So if you have a new filter with no bacteria the ammonia will spike because there is not bacteria to convert it which will cause an ammonia spike for two weeks after the introduction of fish into an unestablished tank. Then once ammonia settles in the tank then nitrite will spike and that will take another two weeks (on average) to spike and die back down to 0. In an established tank a tank should read 0 ammonia and 0 nitrite at ALL times. This is what is meant by cycling a tank. You have to let the filter go through the ammonia and nitrite spikes. After it is cycled you will only have to check nitrate (it is still good to check the others just to make sure everything is doing fine) and do water changes accordingly. I would recommend a Penguin or Emperor Filter for a tank with puffers since they contain Bio-Wheels which is the most up to date technology that can keep water quality pristine. What kind of test kit are you using? Also what kind of puffers are you keeping? They should eat snails at any size. Anyway, I hope this helps and is not too confusing (the Nitrogen Cycle and testing can be kinda scientific and can easily confuse people).

Green spotted puffers are brackish water fish, but short term freshwater will not kill them.

The dragon gogby is brackish water too, but does not need the specific gravity the GSPs do.

Puffers are totally unable to withstand any ammonia or nitrite, so that is likely what has killed your puffers in the past. Nitrate that high will have the same effect, but more slowly.

I think you need to read up on cycling tanks and the requirements of the fish you want to keep.

Do a 50% water change while cleaning the gravel to reduce the nitrates.

Please read this article & all the recomended links: http://www.tomgriffin.com/aquasource/newtanksyndrome.shtml

What are the ammonia levels?

Please don't house a dragon/violet goby w/any puffers, they will KILL IT!!!