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Discussion Starter #1
i Have a flounder in a 10 gallon (its an 1 inch at most) it is in with some zebras, glofish, upside down catfish, 2 black skirted tetra, and a platy(it was one of a fry that which out of the broad and its parents it was the only one to survive.
I need to kno if it needs to be moved to a saltwater tank and will a 55 be big enough when it gets bigger.
 

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your little guy there is fine at the time but will need a bigger tank as it grows. a 10 gallon tank can hold two adults alone.but you could always go bigger :D flounders can grow up to about 4". as they grow you add small amounts of salt and slowly turn the tank brackish.
 

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Is this the same flounder that people eat? If so, how will it not get larger than 4"?

 

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thats a truly big flounder there. in aquariums fish are smaller than they would be in open waters, and thats probably another species of flounder.
BTW is thats you fishing? :nicefish:
 

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haha no I just found it via Google
 

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there are many fish sold as freshwater flounder 99% of them are brackish, there are a few that are true freshwater though.

if you post a pic and include one of its tail and underside I can give you a fairly accurate id and then can say if it is brackish or not.
 

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Discussion Starter #7
I will get pics asap but do they eat algea? and do they scavenge the bottom? I have pics just got to load them up hopfully in my next post :D
 

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I'm pretty certain that is a Catathyridium jenynsii which is one of the true freshwater flounders, and one I ve kept. they are however sub-tropical so the temp should be between 20 and 26c

the main problem keeping any flounder is feeding, most are hard to feed and every one I've kept stops eating at one point for no apparent reason and subsequently dies. my C.jenynsii managed to stay alive for 7 months before stopping eating. the diet was (frozen) mysis, prawn, (live) bloodworm, glassworm and mealworms.
an adult should reach 23cm but I doubt that will happen in captivity.

the best set up is a fast flow tank, like a river tank, with lots of round boulders and plenty of O2. substrate should be sand as they hide in it so an area of the tank should be clear of boulders for this purpose.
your 10g is probably a bit on the small size and I've kept all my flounders in no less than 30g

HTH
 

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I think I might be too late for this reply, but here's the info that I have gathered so far:
Can grow up to 6 inches.
Will NOT eat algae, they prefer live food but can be trained to sinking pellets.
Must not be kept in a tank smaller than 20 gallons.
Brackish water when it grows older.
Preferably sandy substrate.

Good luck with your flounder!
 

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Im sorry I didnt post early but i've got some info for you. I have a 5" flounder thats about as big as they get. He has been in freshwater all his life and still is and hes thriving. only the only way he eats is when hes on the side of the tank you put a shrimp on somthing long and stick it NEAR his face and he will snatch it. All flounder travel through FW and SW conditions at somtime in there life.
 
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