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Not sure how old your tank is but have you checked your nitrite levels. Have you added any rock (base rock) to the tank lately.

There is a really good book about sharks the guys in the fish only and aggressive tanks forum on reef central will tell you. As far as I am aware though you are not allow to keep the sharks but I geuss if you were to try a dog shark (I think they max out at 3 feet) or something similar would be practical but a huge tank excellent filtration and a whole lot of knowledge are a must before trying.

Apple snails are good though, 1 will feed both quite quickly. My puffers loved them when I used to feed them. You can also use shell on shrimp/prawns but obviously not a whole prawn.

Supermarket is the best place to get them as they are cheap. Frozen is fine, just inspect what you buy as sometimes the delivery agencys stuff up and accidently/purposefully refreeze the stock which is not good

Bloodworms are fine, but not as a stable diet. Try and get them use to snails you may have to break the shell so they figure out that there is actually food in there. Just watch how many snails you put in due to the fact that a dead snail can take your whole tank with it, especially at 84l. Just so you know you will need to look at a 50 gallon (200 litres) tank minimum for these guys I would suggest you get it sooner rather than later.

I feed mine Mussells, shrimp, scallops, squid, vege mixes, Krill, Mysis, and also rockpool critters such as crabs and snails as they need crunchy stuff to eat to keep there teeth down. Also at 5-6cm 1.010 should be fine, provided that they were either A) Previously in a tank that was at this SG B) Have been acclimated to this SG Over the next couple of days watch the belly colours and tail to give you an indication on there health constantly dark means there COULD be a problem. What size tank are they in and what sort of filtration are you using. Also the tank was cycled BEFORE putting the puffers in right?

If that is what they are used to at the moment then leave it there, how big are they

Congrats Try and get some pictures up

Yes there is a number of freshwater puffers however getting them in new zealand is a different story. If you want something that grows to be a moster then you are looking at something like a fahaka puffer which can grow to 15-18" or you can go with a brazillian and dwarf puffers which stay around the 1.5-3" mark.

You go by there size as to when to go full marine, as the grow you change the sg of the tank ie less than 2 inches is low brackish, greater than 2 - 4 inches is mid-high brackish 4-6 inches is marine. If you are going to purchase them, make sure they are GSP and not figure 8 puffers as the latter stays in brackish, it is very easy to tell the difference. Also if you are going to purchase them make sure you find out what sg they are in now due to the fact that not all fish shops stick to the rules regarding these fish. Other than that enjoy you will have a fish with alot of personality and also amazing hunting ability

Well it depends on how the shop has labelled them but if it is a GSP (Green spotted puffer) they are very cool fish I currently have 2, they do have special requirements though and alot can be read on the website http://www.thepufferforum.com. Just to summarise: They are puffers and therefore require crunchy food to keep there teeth down ie snails, crabs, musells, shell on shrimp. The GSP's can grow to 6 inches and require at least a 50 gallon tank (200 litres) to keep the happy at this size. They start of as a brackish fish and slowly migrate to full marine so be prepared to go full marine ie skimmer and such. They are scaleless fish so you cant use normal medication for disease. As for tank mates due to the fact they end up full marine I would sugesst you keep the tank as a species only tank. If you have your heart set on tankmates right away you can choose one of the many brackish fish ie bumble gobies but be prepared to keep replacing them as the puffers will eat or at least try to eat many tankmates. They are also fin nippers so the larger the tank the better especially when adding new tank mates as this will lessen the stresses. Also make sure you tank is cycled BEFORE putting them in as you will basically kill them they have no tollerance for ammonia.

From what I understand it is a pvc pipe glue/bonding agent of somesort should be available from bunnings or most hardware stores

Why would it be restricted diodon holocanthus is permitted as are most puffers I can not see why diodon nicthermus would be restricted just a matter of someone importing it for me. Well thats how I understand the MAF list, is there something I am missing

How can we import a fish from that website, I would love to have that puffer. Reef, any ideas

What about the digital salinity readers I have purchased one of trademe and I seem to be calibrating it alot which can get annoying, are refractometers better than there digital counter parts