For the poster that said the tank has been up a "month already".
Is that a month from scratch, or a month after it was cycled?
It usually takes 6-8 weeks for a tank to completely cycle (cycling means to acquire enough of a population of ammonia consuming bacteria to keep the water from becoming a toxic soup of fish urine)
If it was from scratch, without seeded media in the filter or substrate, it may be that the oscar is being poisoned by its own urine, unless you are doing daily water changes to dilute the poison and invisible soup. One of the signs of ammonia poisoning is being schizophrenic (long bouts of being listless, with bouts wacko behaviour.)
By the way, good bacteria are sessile (meaning they live on surfaces (filter media, plants, gravel, rocks)) so you do not remove good bacteria by doing water changes, you just dilute the poison.
Is that a month from scratch, or a month after it was cycled?
It usually takes 6-8 weeks for a tank to completely cycle (cycling means to acquire enough of a population of ammonia consuming bacteria to keep the water from becoming a toxic soup of fish urine)
If it was from scratch, without seeded media in the filter or substrate, it may be that the oscar is being poisoned by its own urine, unless you are doing daily water changes to dilute the poison and invisible soup. One of the signs of ammonia poisoning is being schizophrenic (long bouts of being listless, with bouts wacko behaviour.)
By the way, good bacteria are sessile (meaning they live on surfaces (filter media, plants, gravel, rocks)) so you do not remove good bacteria by doing water changes, you just dilute the poison.
