Re: DIY Chillers
I heard a little bird mentioning my name! 
Amar, a large surface area to water depth (shallow) ratio, along with good ventilation (or a fan), should work best for your purpose without implementing a chiller.
If you wish to further increase the oxygen level or cool the water further, plus the advantage of wet/dry filtration, search the archive for Henri DeBryun filter (modification from a OHF). It is very possible to achieve 24ºC and even slightly lower, especially during the monsoon season.
I'm back & keeping 'em fingers wet,
Ronnie Lee
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