Hello, just a quickie, i've finally got my tank sorted, well almost , apart from the nitrite is a little high (what do i need to do ? ). My question is , i have to oscar's 1 a little bigger than the other, 99% of the time they just swim closley together and follow each other around, they are eating well. but what i have noticed is that the smaller of the 2 keeps hiding under this certain rock, never has before, but this has been going on for about 2 weeks, any idea's what this could be? when i say hide , he/she literally stays there until i disturb the tank or feeding time.

Regards

Leeroy

Sounds like you are in the cycling process (BGH will like this thread )

I assume that your ammonia is zero? What is the reading of your nitrite and have you got any nitrate present now?

Not sure why the fish is hiding, have you noticed any bullying going on?

can you give us details:
size of the tank?
how long it had been set up?
capacity of the pump?
water parameter?

Tank size is 40 gallons uk

its been running now for about 3 months


can i do any harm by adding a 2nd filter??

Unfortunately 40 gallons isn't even big enough for one Oscar, let alone two. Rather than spending more money on filtration, you'd be better off putting it towards a much bigger tank. Okay, the Oscars are small at the moment, but they will soon grow and that's when you will start running into water quality problems. Obviously the more filtration you can have the better, unless you add a large sump filter, you're still just going to have 40 gallons of water and that just isn't enough to sustain one Oscar.

adding a new filter to the old one will not harm because the algae is in the old filter and rock so its just gonna help i added a 2nd filter to my tank about a week ago and its helping keeping the water clean