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I have a three week old aquarium with five happy guppies but I’ve noticed algae build up on the glass and a little on the rocks and live plants. What would you suggest would be the best, interesting and pretty bottom dweller that stays small and is easy to care for? The tank has a good water change routine, tests well and is 65litres. It’s a long rectangular standard shaped tank with heater, filter, thermometer, floating live plants attached to bark, gravel and two large rocks.