70 gallons or 70 liters? Also if its a 70 liter tank you could probably put a few more guppies or neon tetras. Also, you can get a male betta and put it in there as long as you don't have any fish that look like a guppy. You should also consider putting 1-2 pea puffers in your tank they are freshwater pufferfish and you can buy them online at ebay, amazon, or a reliable fish website. If its a 70 GALLON tank you could put a huge shcool of guppies and neon tetras, or add a a few more guppies and neon tetras but put a lovely school of 6-8 female bettas, although if they become to aggresive remove them. Or mabye you could put female swordtails in your tank. You could also add 6-9 mollies or platties. You could get zebra danio glofish or the standard kind and add a few dwarf gouramis.
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