Here's a general idea:
* Small Tetras: These include neon tetras, cardinal tetras, and glowlight tetras. They typically grow to about 1 inch long and weigh less than 1 gram each.
* Medium Tetras: These include black skirt tetras, serpae tetras, and red-line tetras. They can grow to 2-3 inches long and weigh around 2-5 grams each.
* Large Tetras: These include the silver dollar tetra, the x-ray tetra, and the emperor tetra. They can grow to 4-6 inches long and weigh between 5-15 grams each.
Note: These are just estimates, and the actual weight of a specific tetra fish can vary depending on its age, diet, and overall health.