Originally Posted by hockeyhamsters
sorry i know nothing about fish tanks... but i was wondering how to post questions??
You just did?
Do you mean how to make a thread? Just click the button that says "New Thread"
the amonia,nitrate,ph,etc are all good, I check them daily,and the filter I got from aquarium arts,for saltwater fish the media that came with it is eheim substrat pro,the filter is for up to 80 gallons and I have 36,so I think that would be better,keep the tank cleaner,I am planning on getting a bigger tank,the puffer is getting alot bigger than I thought,he is a porrcipine puffer,the clown is a ocellaris,the damsels are a blu devil and a chromis, the blenny is a sailfin blennie
Just because a filter can run in saltwater doesn't mean it's the best fit for your tank. Do you have live rock? Live rock and a good protein skimmer (my favorites are the AquaC skimmers although there are certainly others that will work) will do a MUCH better job than your canister. The canister filter is a good place to put media like Carbon but they need to be cleaned frequently and aren't the best as the only filter.
Porcupine puffers get huge and are capable of eating smaller fish. They can also be pretty nippy and are prone to "pacing" when the tank is too small/not interesting enough. He's already way too big for your tank and needs to be re-homed or upgraded to a new tank immediately. I'm not sure why you bought one for such a small tank? Maybe the fish store advised you wrong? This is why it's so important to research the species before bringing home a fish (especially a wild-caught specimen, like most saltwater fish sold). Things won't improve in your tank if you can't move the puffer, he's stressed out and probably making a mess, too.
The ocellaris clownfish is a good pick for your sized tank. He will probably end up fighting with the blue devil damsel. The devil damsel will become more and more aggressive as time goes on so I would personally re-home him or move him to his own tank.
The chromis is a schooling fish that needs more space than you're currently providing. They favor long tanks rather than tall and should be kept in groups of 5+ minimum. Your single chromis is probably very stressed. I would re-home him if you can't move him to a new tank with buddies.
By sailfin blenny, do you mean the drab-colored (but comical!) fish usually sold as a lawnmower blenny? Or a different species? I've seen a few fish go by that name. Many commonly sold blennies, like the lawnmower, are mostly herbivorous and starvation is a risk if you can't get them eating commercial foods. Is yours eating?
How long has this tank been set up? Your fish choices seem to be pretty random. If this is under a store's advisement, it's time to start doing your own reading.