I need to decide on an algae eater for 2 of my tanks. One tank is 128 liters/ 33 gallons, has live plants, 3 Platies, and 5 Swordtails, plus one shrimp. The second tank is 70 liters/ 18 gallons, and will have a Dwarf Gourami couple, and 2 shrimp, and live plants. pH in each tank is about 8.0, GH...