red tail catfish help!!

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hi
i bought 2 red tail cat fish there 3 inch babies and im currently keeping them in a 18inch wide x 24inch tall x 60inch long ( 1ft and a half x 2ft tall x 5ft long ) i am aware how big they grow
,but can you please help me with the following questions :
1) what bulky supermarket foods can i feed them to drive down the cost
2) i know they can grow over 5 ft in the wild but will they grow 5 ft in a tank or is it possible they may grow just a good 3ft,please answer onestly as i hear so many diffrent storeys on this.and i at what rate,i know this varies.
3) with out saying an ocean sized tank what would be a respectable sized tank to keep them in.
4)a question im desperate to find an answer for is!!! what other fish can i keep with them,i know they have to be to keep for them to swallow,so what grows at a similar rate with them and doest just want to kill each other,i hear black pacu are a good idea because they grow big and there wide so dont fit in the mouth so easy but i would really like to keep 1 or 2 giant red snake heads (channa micropeltes),ant feed back on this would be great.

SORRY THE THREAD IS SO LONG,THANKS FOR LOOKING .

It's great that you are trying to learn as much as you can about keeping these fish, but these are questions you should have asked before you bought them. I apologize for sounding like your father, but you should do your research BEFORE buying any living creature, not after.

The only reason they will not grow as large as they do in the wild is if you do not provide them with an adequate diet, clean water, enough space etc. The advice already given in regards to diet is good. I would say a minimum tank/pond would have a footprint of around 12' x 8' with at least 3' of height. If you are considering adding monster tankmates (Pacu also get huge) you would need an even bigger tank (especially more height since Pacu grow almost as large vertically as they grow lengthwise). If you live in the Northeast (Cambridge) heating this amount of water in the winter is going to be a big challenge. The cost to feed and run a tank this large could run into several hundred dollars per month, so hopefully your concern with feeding cost is in regards to when they are full sized and not at their present 3".
 
For some reason it won't let me load any pics

Had the same problem a while back so I tried the "basic uploader" icon in the lower right hand corner in the small window after you've clicked the Insert Image icon and worked like a charm, or you can open account at photobucket and just post links to the page at photobucket.
 
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