Aquarium Coolers/chillers-recommendations, Please

[SherriSixxx]

Hi All! Can somebody recommend me a cooler that actually works well at cooling the water and is not too expensive? For a tank with about 100 litres water, please. Also if you have bad experiences of a cooler, lemme know as well, so I won't waste my money. I got an AquaMedic Mini Cooler, that is absolutely useless, doesn't even manage to cool the water on 80 litre tank.Grr

Many thanks in advance