Green Mandarin

you need a mature tank about 9 months old. you'll probably need a bigger tank for one mandarin let alone two in this size tank.
 
that's just my opinion by the way. you could ask steve in "intended fish purchase" thread.

welcome to reef central!
 
i certainly wouldn't put a pair in that small a tank.

even a single fish would be very dicey in something that little.

the best general rule of thumb for dragonets of any sort is 75 gallon tank, with at least a 20 gallon sized productive refugium to supply them with food.

you will occasionally hear about people keeping them in smaller setups, but that is very much the exception, not the rule, and i would not advocate any even reasonably novice person attempt it.

whenever someone starts asking about keeping these guys, i direct them to my posts in the following threads. i feel they make up a good Mandy 101:

http://reefcentral.com/forums/showthread.php?t=2374330
http://reefcentral.com/forums/showthread.php?t=2367532
http://reefcentral.com/forums/showthread.php?t=2363996

it can be tricky to get the conditions for these right in your tank, as their are obligate feeders. like any obligate feeders, your success will be predicated on supplying them the conditions they require to sustain their very specific feeding habits and requirements.
 
With a 20 gallon fuge a year old and packed with cheato moss and rock, you can keep one very small mandarin in a 50 gallon tank. Increase the fuge size to 30 and you'd probably be ok in a 40. These guys live off live creatures that mass very little, and they eat over 2000 a day.
 
If your tank can support the bio load go ahead. I would personally not put them in a tank unless it a year old. I don't think they will be all that happy in here so a bigger tank would be ideal. Also another great rule of thumb is one inch of fish per gallon.
 
That rule doesn't hold. This 2" fish requires nearly 100 gallons to grow its food.
 
I have a 40b with a 20l sump and a very fat and happy green mandarin. I would definitely not do a pair though. My tank has been set up at our new place since Jan. (it was also running for a year before we moved). I add pods here and there as I remember and my once starving mandy (he was that way at the store) is now quite fat and active. I did pick out a small one to start with.
 
I had a mature 65 and it couldn't support a mandarin which was also eating brine and formula one. Very doubtful that small a tank will work.
 
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