hi, for your tank size, you definately do not need a chiller.. If u want to lower the temperature, u could use a small clip on fan..
But in the long term, i would recommend getting a larger tank as the water parameters can be kept stable easier..
Also, what type of shrimps do you plan on keeping?
Do read up more here before embarking on your tank or you may have have high casualties though....
You can ask questions here, i'm sure many members are willing to help or just send me a private message and i'll try my best to helpyou out..,
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