Sorry I'm completely new to this forum but would really like some help in lowering my ammonia and nitrite levels as fast as possible.
Four days ago I had a happy tank with 5 Rummy Nose Tetras and a pair of Killifish (male and female)... then then next day all that was left was the male Killifish!
I've had the Tetras for just under a year, in the same tank, and introduced the Killifish about 5 weeks ago. Everything has been fine up until 4 days ago when I decided the plants were looking very tired and covered in algae so I decided to replace them - I added 2 more java ferns, and replaced the Dwarf Sagittaria for newer ones... then BOOM, the next day I woke up to dead fish.
After doing a water test I discovered that the ammonia levels and nitrite levels were sky high so I've been doing 50% partial water changes each day since then to bring the levels down... but they've stayed exactly the same!
The Killifish doesn't seem to be phased as he's acting no different since when I introduced him, however I really want to bring the ammonia and nitrite levels down as quickly as possible but the water changes don't seem to be having any effect.
Sorry if this is a bit vague, but can anyone suggest why this may have happened all of a sudden, and possibly why the ammonia and nitrite levels won't budge?
Also, if you need any further info then please let me know.