I agree. I don't think they tank was cycled correctly. What's done is done. Let's try to fix the result.
As others have said, I would do water changes every day/other day. Keep testing the ph, kh, and gh.
My tap water is similar to yours.
ph 7.6
gh 5
kh 4
For my tang tank, I add 1 teaspoon epsom salt, baking soda, and marine salt for each 5 gallons of tap water I add.
Do not clean your filter for awhile. Leave it be so it can grow some bacteria. Also, put something in the tank and/or filter to grow bacteria. Lava rock or something similar is great for growing bacteria (has alot of small holes in it). Or put some ceramic discs in your filter to grow bacteria. Your foam in your ac is growing bacteria also, so when you finally clean it, use a bowl with aquarium water to rinse it.
Other than that, sounds like it's a waiting game for your tank to build up bacteria and finish the cycling process. Brichari are pretty tough fish, so make gradual changes to ph, gh, and kh and they might make it.
One more thing.....ammonia is extremely toxic with higher ph levels. I would slowly reduce the ph to mid-high 7's until the ammonia is under control. Then slowly raise it to around 8 once all signs of ammonia are gone.
Hope that helps.
As others have said, I would do water changes every day/other day. Keep testing the ph, kh, and gh.
My tap water is similar to yours.
ph 7.6
gh 5
kh 4
For my tang tank, I add 1 teaspoon epsom salt, baking soda, and marine salt for each 5 gallons of tap water I add.
Do not clean your filter for awhile. Leave it be so it can grow some bacteria. Also, put something in the tank and/or filter to grow bacteria. Lava rock or something similar is great for growing bacteria (has alot of small holes in it). Or put some ceramic discs in your filter to grow bacteria. Your foam in your ac is growing bacteria also, so when you finally clean it, use a bowl with aquarium water to rinse it.
Other than that, sounds like it's a waiting game for your tank to build up bacteria and finish the cycling process. Brichari are pretty tough fish, so make gradual changes to ph, gh, and kh and they might make it.
One more thing.....ammonia is extremely toxic with higher ph levels. I would slowly reduce the ph to mid-high 7's until the ammonia is under control. Then slowly raise it to around 8 once all signs of ammonia are gone.
Hope that helps.