Against my direction, my friend gave a single piece of mozzarella cheese (one shredded piece) to my 1.75" GSP. The GSP literally devoured it in 2 seconds. I immediately looked online about the dangers of feeding fish cheese, and came upon a single thread on yahoo questions where people warned against it, and in one case, explained that it will kill the fish.
Can anyone provide any insight? I'm worried. The cheese obviously has lactose, fats, and all kinds of strange things that a puffer would never eat. So far - the puffer seems fine.
Puffer ate a piece of cheese
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5) How long the aquarium has been set up, and how did you cycle it? If you don't know what cycling is read this: Fishless Cycling Article and familiarize yourself with all the information. Yes. All of it.
We want to help, and providing this information will go a LONG way to getting a diagnosis and hopeful cure that much faster.
While you wait for assistance:
One of the easiest and best ways to help your fish feel better is clean water! If you are already on a regular water change schedule (50% weekly is recommended) a good step to making your fish more comfortable while waiting for diagnosis/suggestions is to do a large water change immediately. Feel free to repeat daily or as often as you can, clean water is always a good thing! Use of Amquel or Prime as a dechlor may help with any ammonia or nitrite issues, and is highly recommended.
Note - if you do not normally do large water changes, doing a sudden, large water change could shock your fish by suddenly changing their established water chemistry. Clean water is still your first goal, so in this case, do several smaller (10%) water changes over the next day or two before starting any large ones.
Read this before posting!!
Since this board has been up, we have found there are several questions that routinely get asked in order to help diagnose problems. If you can have that information to begin with in your post, we'll be able to help right away (if we can!) without having to wait for you to post the info we need.
1) Your water parameters - pH, Ammonia, Nitrite, Nitrates and salinity (if appropriate). This is by far the most important information you can provide! Do not answer this with "Fine" "Perfect" "ok", that tells us nothing. We need hard numbers.
2) Tank size and a list of ALL inhabitants. Include algae eaters, plecos, everything. We need to know what you have and how big the tank is.
3) Feeding, water change schedule and a list of all products you are using or have added to the tank (examples: Cycle, Amquel, salt, etc)
4) What changes you've made in the tank in the last week or so. Sometimes its the little things that make all the difference.
5) How long the aquarium has been set up, and how did you cycle it? If you don't know what cycling is read this: Fishless Cycling Article and familiarize yourself with all the information. Yes. All of it.
We want to help, and providing this information will go a LONG way to getting a diagnosis and hopeful cure that much faster.
While you wait for assistance:
One of the easiest and best ways to help your fish feel better is clean water! If you are already on a regular water change schedule (50% weekly is recommended) a good step to making your fish more comfortable while waiting for diagnosis/suggestions is to do a large water change immediately. Feel free to repeat daily or as often as you can, clean water is always a good thing! Use of Amquel or Prime as a dechlor may help with any ammonia or nitrite issues, and is highly recommended.
Note - if you do not normally do large water changes, doing a sudden, large water change could shock your fish by suddenly changing their established water chemistry. Clean water is still your first goal, so in this case, do several smaller (10%) water changes over the next day or two before starting any large ones.
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Re: Puffer ate a piece of cheese
I doubt highly that one piece of cheese will hurt him but be sure to stress it never happens again. Puffers need crunchy foods, like snails, mussels, clams and etc. I don't think cheese is one of their natural prey anyways. 
Check out the article in the librabry on Green Spotted Puffers and also the feeding article that is in there.

Check out the article in the librabry on Green Spotted Puffers and also the feeding article that is in there.
E.Ridgeway
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Re: Puffer ate a piece of cheese
One instance shouldn't be a problem. Just be sure to heavily "suggest" that your friend doesn't feed your fish random food. That, or get a new friend. 
Personally, any "friend" who ignores me when I tell them not to do things that bother me gets reprimanded, but I'm also highly temperamental when it comes to people doing things I hate.
Personally, any "friend" who ignores me when I tell them not to do things that bother me gets reprimanded, but I'm also highly temperamental when it comes to people doing things I hate.
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- Paul
40 gallon - Future home of Abei Puffer
28 gallon - 1 Abei Puffer (Captain Abe)
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- Paul
40 gallon - Future home of Abei Puffer
28 gallon - 1 Abei Puffer (Captain Abe)
5 gallon - 1 Betta (Frederico)