Welcome to the forum. And you cant ask too many questions. We all hope your stay will be a pleasant one.
Yes you can put heaters in acrylic tanks. Jungle makes a 7 watt heater that may work. Do not keep bettas and goldies together. Clean water and a healthy diet will bring your betta's fins back to health.
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For in much wisdom [is] much grief: and he that increaseth knowledge increaseth sorrow.
Member of the AGA (Aquatic Gardner's Association)
Member of the IBC (International Betta Congress)
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