oscar

[suprd71]

Some people may think I'm all wet, but I believe a 75 gal tank is too small for an oscar over 7.5". So if you put it in a 75, with normal growth, you will need another larger tank in about a month or so.
I agree with tlindsey, you will need to move the old filter to the 75 and keep it running until the new tank cycles.
That is, unless the filter and substrate laden with the pathogenic bacteria that are making the oscar sick, as a result of being kept too small tank.
Would you keep a normal size dog in a tiny bathroom 24/7 ?

Not all wet in the slightest Duane. Been keeping Oscars a very long time. Never had one past my very first(1969) in a 4ft tank. I wager many eyebrows would raise to see my male Jag alone in a 7ft 265. He is massive, healthy and quite content. My Oscars are all in 180 and 220g tanks.

 

[Rmelz]

It's not the water that gets cycled. The water actually has little to no benefits when it comes to whether a tank is cycled or not, it's the objects within the tank that provide a surface for the bacteria to colonize/live on that is what gets "cycled".

Then why do you only do a 25-50% water change? I always seed a new tank with old filter media and half used water.

 

[Fish on Fire]

Then why do you only do a 25-50% water change? I always seed a new tank with old filter media and half used water.

Water condition stability. New water from the tap might be a bit different in terms of hardness, ph, etc, from the tank water. The goal is to keep a somewhat stable environment while, at the same time, keeping nitrates down to a minimum. That's why you rarely see people pulling 100% water changes.

 

[Jc_Aquatics]

Water condition stability. New water from the tap might be a bit different in terms of hardness, ph, etc, from the tank water. The goal is to keep a somewhat stable environment while, at the same time, keeping nitrates down to a minimum. That's why you rarely see people pulling 100% water changes.

This is my temporary setup until Monday or Tuesday. My filter comes on Monday

 

[Rmelz]

Water condition stability. New water from the tap might be a bit different in terms of hardness, ph, etc, from the tank water. The goal is to keep a somewhat stable environment while, at the same time, keeping nitrates down to a minimum. That's why you rarely see people pulling 100% water changes.

\
My point exactly. He will be moving the oscar from a 20 to a 75, therefore he should use all the water in the 20 for the 75. The water has it's benefits.

 

[duanes]

Old Water does not carry beneficial bacteria, they are sessile (live as a biofilm on surfaces).
This is why producers of bio media place such emphasis and importance on the amount of surface area certain bio media provide, more area, more room for biofilm, better biofiltration.

 

[jaws7777]

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My point exactly. He will be moving the oscar from a 20 to a 75, therefore he should use all the water in the 20 for the 75. The water has it's benefits.

I do fin level waterchanges every week and drain the sump down close to half way. Moving old water to a new tank doesnt do much besides moving nitrates/dirty water. Does little to nothing in regards to cycling

 

[Rmelz]

Maybe i'm wrong about water but i've never had an issue when seeding a new tank.

 

[Jc_Aquatics]

Update. Just got my new filter and oscar has been in the 75 for 2 days running the old filter to help with the cycle too. He still is inactive and sits at the bottom. Is there any way I can avoid meds. No sign of ich or hith. I guess time will tell.

 

[tlindsey]

Update. Just got my new filter and oscar has been in the 75 for 2 days running the old filter to help with the cycle too. He still is inactive and sits at the bottom. Is there any way I can avoid meds. No sign of ich or hith. I guess time will tell.

The Oscar needs time to acclimate to its new home.