Thai goldfish had better use more than 4 metal halogen lamps or cold white LED strip with color temperature above 8000.

Sunlights or fluorescent lamps can be used to raise goldfish indoors, but it is best to be exposed to natural sunlight every day. You need to turn off the lights indoors at night, and you can't keep goldfish with dazzling lights. You should choose lights with saturated colors, such as those that can make goldfish show natural colors.