TBH looking at your tank I would go with neon's (Maybe 4/6) and Guppies (4/6) This is what my mum has, they get one well, are easy to maintain and look very preety... it will also be what I will be having as soon as I get my new tank set up for the goldies to move over into x

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Thanks for reading my post - Have a good day!
Mummy to Cody-Lee - 2 Year Old Patterdale X JRT