Water parameters: Ammonia tested by LFS and my own test kit= 0.25ppm ( i'm not sure why?)
Nitrites tested by LFS and my own test kit= 0ppm
Nitrates tested by LFS and my own kit: 10-20ppm
( I have api freshwater master kit but it is 5 years old so I wasn't sure how accurate it was)
pH: LFS just said it was fine I don't remember the number, my kit said either 8.4 or 8.8 it was hard to distinguish (this is making me nervous)
salinity: 1.012
Tank Size: 30 gallons with 75 gallon filter
Inhabitants: 1 Green Spotted Puffer (at least 5 yrs old but only about 2-3 inches), recently added a ghost shrimp 2 days ago to try to get him to eat, ever since he got sick we saw a huge amount of small, white, long spiral shaped snails come out of nowhere.
Normal schedule:
Feed a quarter frozen blood worms daily, small pest snails from LFS occasionally, Water changes not often enough, usually monthly we do a 60% water change
No recent changes to tank
Aquarium set up 5 years ago, started with fish less cycle then added 2 mollies first before getting the puffer, no problems in the past (mollies no longer in tank)
5 days ago the puffer seemed dull in color and was sleeping in odd places, just not acting himself. There was a large amount of dark green algae that we had never seen before. He ate ok so we decided to wait until morning to do water change. Did 60% water change and removed all algae from decor and tank. ( we get our salt and fresh water from LFS and mix to desired salinity). That night he sucked a worm in but kept spitting it back out. He has not eaten anything since. He seems to be bumping into things and is lethargic laying out in the open. He almost seems blind at times like he cant see the food or decor around him. We put a ghost shrimp in the tank to entice him to eat. The shrimp actually touched him and he didn't even flinch. The guy at the store wasnt to concerned with water levels but gave us some established media to add to our filter.
Today we noticed his teeth possibly looked overgrown and he seemed like he was dying so we decided to give trimming his teeth with clove oil a shot. If he was too weak to recover at least he was no longer suffering and we didn't have time to find finquel. He survived the trim which he definetly needed and seems a little better but still wont eat and is not himself. We are definetly keeping up with 50% weekly water changes in the future if he pulls through. Any ideas as to what to do next? Also should he be bigger after 5+ years. He hasnt really grown since we got him? This all came on so suddenly and we dont want him suffering!!