Odd question about biological filter

[Sky042]

Heres the scenario. I have a full cycled and mature tank that is currently housing my oscar (37USG with Emperor 280 filter) He's been in this tank little over a year and has grown out of it.

This thursday I pickup the Oscars new home a 125 Gallon setup which I'll be transfering him into as quickly as I can get it cycled(going to seed it with a TON of mature media)

Now this leaves me with a 37Gal tank with a full biological filter developed. I'd like to do like a 35-40% water change and then re-stock it with something else. I'm wondering How much fish a bacteria bed that was supporting a 9" oscar could support knowing how messy oscars are and how they produce something like 35% of their body weight in urine per day.

So could I feasibly stock the tank with lets say a dozen rummy nose tetras or something along those lines without haveing to really worry about a ammonia or nitrite spike. My gut instinct is that I'd be fine but figured I'd bounce the idea off people here.

 

[mlee0332]

Absolutely! That should be fine....

BTW: you can run the filter from the 37 g in the 125 with its filter, and the tank will be fully cycled for your oscar. this will also allow the bacteria to migrate and might cycle it faster.

 

[Sky042]

Absolutely! That should be fine....

BTW: you can run the filter from the 37 g in the 125 with its filter, and the tank will be fully cycled for your oscar. this will also allow the bacteria to migrate and might cycle it faster.

For the cycle on the 125 I have chunks of floss in a cascade 700 and a fluva 304 that are mature and stocked with bacteria from other tanks that I'm going to put into the 125 and into it's filters(2 x Cascade 1200) this should make the biological filter in the 125 nearly instantaneous.

 

[mlee0332]

your good to go then! Good luck!