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Did you put the media from the tetra filter into the new aquaclear? If you didn't you could of easily sent your tank into a mini cycle. Can you post water stats with numbers, regardless if its okay or not. Also what test kit are you using.

BTW you have some very incompatible fish sharing that tank, which could be the reason for the fish loss. If it isn't now it will be down the road when they start eating each other.
 

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yeah you lost your cycle when you swapped filters. If you are unfamiliar with cycling an aquarium I highly suggest you research the topic. Bacteria is in the filter media that breaks down toxins produced by the fish. This bacteria take time to establish, 4-6+ weeks often. Without it the toxins build up in the water and kill the fish. Not saving the media from the tetra filter caused a large loss of bacteria resulting in fish loss. Your nitrite at 1ppm is high, easily high enough to kill gouramis. It should always be zero, since it is toxic to fish. The presence of nitrite almost always happens alongside an ammonia spike, which again is toxic and can easily kill your fish. The ammonia spike comes first since it is produced by the fish with the nitrite following. Your test strips do not test for ammonia. I would recommend getting an API liquid test kit its what many people use.

Currently I would recommend a large water change. 50% at least to cut down the nitrite levels. You will be doing a lot of water changes for a while to keep levels down until the new filter establishes. 50% every other day if not more. A better test kit will help you determine this. Stop feeding the fish for the most part, like once every 3 days or so to try to slow down the build up. For the future always transfer media when changing filters. Even if you need to shred up the old media and shove it in the new filter it will avoid water quality issues. Its usually recommend no more then 1/3 of the filter media be replaced at one time.

The tankmates may be fine for now but 4 gouramis in one tank was asking for trouble. The pitcus and gar will potentially reach 8-10" in a proper sized tank. Just don't be surprised if smaller tank mates disappear one night.
 

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Nitrite should be zero no matter how long between water changes. Far as KH I would bet that is something to do with your water utility or possibly the test strips misreading if they were stored improperly. Its unlikely IMO that a change in KH killed your fish, nitrite and ammonia are much much more likely causes. Only other cause for KH if it measures higher then your tap water is the presence of crushed coral or limestone in the tank.
 
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