RE: your bacteria start up question, I've used Cycle and Bio-Spira by Marineland. If you can find it, as it is only sold refrigerated by select local fish stores, Bio-Spira is the bacteria of choice. It may be somewhat expensive for a 125 gallon, but I can vouch for their claim of cycling a tank overnight. You'll just want to add your fish, and then 10 minutes later add the Bio Spira.
To get as much of the water out of the 55 into the 125, you could try the following:
1) Remove as much of your rocks, substrate, decorations (hopefully you're reusing some from the 55) and move it into the 125. You'll want to bring as much "bacteria" from the old tank to the new. You can even start up your new filter(s) in the 55 so they can establish some bacteria, and also move them to the 125.
2) Empty enough of your water out of the 55 into 5 gallon buckets or some other large containers. You'll need to get enough out so you and hopefully Superman can move the 55.
3) Depending on the final location for your 55, relocate it and locate your 125.
4) Set up your heaters, filters, etc. in the 125.
5) Begin transferring the water from the 55 to the 125 by locating a garden house between the two tanks and creating a suction from the 55 to the 125. (Yes, this usually involves inhaling deeply into the hose on the 125 tank end of the hose, but you'll hear the water rushing down the hose before it gets to you!) It's hard to use a cup or something to get water out of the tank when it gets down near the bottom, so I use the syphon method, even during water changes.
6) Once the fish barely have enough water in the 55, transfer them into the 125.
7) Once you've emptied the 55, fill the rest of the 125 with dechlorinated water as close to the same temperature as the other water.
8) Start your filters as soon as possible, as you want to start mixing the water.
9) Keep an eye on your fish and monitor their potential stress levels. Unless they get really stressed, you'll still want to leave them in the 125 as they acclimate to their new tank.
Hopefully I didn't leave any major details out as I typed this really fast!!
Don't forget, Oscars are hearty fish, so they should be fine.
That might work if you think you can handle the 55 gallon than. Also remeber to take it easy and not tilt the 55 gallon to much or put to much pressure on it as it might break if you do. I recommend you remove all rocks etc before trying it.
Don't fill it (55) all the way up at once. it is better if you allow that to take a few days.
it is also a good idea to save a couple of buckets old water from the 55 gallon and but in the 125 gallon as this will speed up the cycling process considerably.
Thank you for all your helpful advice the 125 is now set up and going well moved the fish into it last night WOW those oscars are not easy to catch all seems to be going very well once again THANKS for all your help
i have 2 oscars about 6 to 61/2 in now were about an in when i got them at wal mart. sometime's they act like they are really running away frm something splashing water out of the 35 gal tank and running into the side of tank making ALOT of NOICE i had to take out ot their hard castle cause they ran into it an took off it looked like a couple of scales (looks white)
and we are feeding them bait shop minnows is that wrong ??? if so what should we feed them???
they seem to love each other, got one at first and he/she seemed so sad wouldn't eat or swim around the man at wal mart said it needed a buddy so i got another one and it loved it and came alive. we have had them about 4or 5 mo.
we just got a 35 gal tank and it look's now as we need a 55gal
and by reading the other notes one time a day is good to feed the oscars???? my husband feed's them ALOT!!!!!! yes they are very messy. and the water is always cloudy look's dirty!!!
i also got a cat to help clean and they tries to eat him (ate his tail off before i took it out.) yes the little cat is still living in a smaller tank.
we just learned about a frozen food (san francisco bay brand) is this better than bait shop minnows????? yes i do also feed them flakes once a day - which they really don't like but they will eat them. i guess they will eat anything
cj Feed your ocsars once a day I found that if I feed more than that I also have cloudy water I think that most of this is caused by there own waste. It does not break down fast enough to be cycled by the ecology of the aquarium . I also found that the nitrate levels get vey high if the waste breaks down too slowly .
I would highly suggest that you no longer feed bait store minnows they are not raised the same way that goldfish are and are prone to fish lice and other disesase not as common to tropical fish and once you have fish lice it is extremely difficult to get rid of . I suggest that you feed pet store goldfish they are a little more money but well worth the hassle you might save yourself. I feed goldfish and pellets and alternate them every other day while they may beg for food [mine do ] they come to the front of the tank and swim up and down . feed only once a day they can go two days without eating but this is very hazzardous to smaller fish in the tank . my oscars also ate my pictus cat about a week ago they will eat any thing they can get in there mouth.
Oscars are like anything alse why eat flakes or pellets when they can eat real fish It may take some time but they will eat the pellet food I feed cichlid gold and they really like it they go after it the same as gold fish also they will as they get bigger tear apart the tank I decorated my 125 with rocks and driftwood they dont seem to move that stuff around as much as the smaller decorations Ed