10-03-2012, 11:49 PM
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Congrats on the new tank!
I'm not the best on stocking, but I have a 29g with the same dimensions, I don't think it's big enough for a rainbow shark. They're gorgeous creatures, but they get big, and will need a LOT more space, and a much longer tank to be able to swim around in comfort at full growth. Much longer as in 4 FEET, lol!
Rainbowfish are gorgeous, but if I remember correctly, the DWARF Rainbows prefer their water to be on the soft side (most Rainbows like it harder). Double-check me on that, I may be mixing things up. . . Guppies prefer hard water, so to me these two wouldn't make an ideal pairing.
You might want to start by figuring out the Gh of the water as it comes from your tap (if you don't already know!) API makes a test for Gh and Kh that runs around $7 on Amazon, but you might be able to get this information from your local water supply company. Ph is a good thing to know before purchasing fish, too.
Guppies are fairly tolerant and adaptable to various water conditions, but this isn't true of all fish, so knowing the hardness of your water is really important!
I hope this helps out somewhat! Always good to see people asking the right questions BEFORE buying the fish! Best of luck with the 29g!