Technically, you can fit 4-5 glofish danios in a 10-gallon tank if you were to follow the ‘one inch per gallon’ rule. However, danios are schooling fish that need to be ideally kept in groups of 6 or more. On top of that, they’re highly active and need ample space to dart around. A 10-gallon tank simply doesn’t have enough room to accommodate their needs.
Unfortunately, you can keep precisely 0 glofish danios in a 5-gallon tank. So if you were to follow the ‘one inch per gallon’ rule, you could technically fit 2 glofish danios that grow around 2 to 2.5 inches long in a 5-gallon tank. But it is not humane to keep glofish in a tank that small.
Both the regular glofish tetra and long-finned glofish tetras are made by genetically modifying the pretty black skirt tetra. The standard glofish tetras grow around 2 inches (5 cm) long, whereas long-finned glofish tetras can reach around 2 ¼ inches (5.5 cm) long in captivity.
Glofish eggs look like regular fish eggs. They’re neither colorful nor do they glow. They are little spherical balls rarely bigger than one millimeter. The eggs are white and almost translucent. A glofish betta’s eggs look just like regular betta’s eggs. And it’s the same for the rest of the 4 species.
Unfortunately, you can add exactly 0 glofish in a 3-gallon tank. Technically, you can fit 1-3 glofish tetras and danios in a tank that small, but we highly, very highly recommend against it.
Currently, there are 5 glofish species available – tetras, danios, barbs, bettas, and sharks. Assuming it’s a species-only tank, you can add 8-10 glofish tetras, 10-12 glofish danios, 5-6 glofish barbs, 4-6 female glofish bettas, and 0 glofish sharks in a 20-gallon tank.
Glofish tetras, sharks, and barbs can go without food for 1-3 weeks. Glofish tetra bettas can survive for 10-14 days, while glofish danios can last for up to 2 weeks.
Glofish can get anywhere between 2 to 6 inches long, depending on the species. Glofish tetras, danios, and bettas are small fish reaching only around 2-2.5 inches long. Glofish barbs get around 3 inches long, and glofish sharks can grow as big as 6 inches!
You can keep 5-6 glofish tetras, 3 female glofish bettas, and 4-5 glofish danios in a 10-gallon tank. But glofish barbs and glofish sharks aren’t suited for tanks this small.
Glofish barbs live for 4-7 years, while glofish tetras can live up to 10 years. Likewise, glofish danios live for around 5 years, and glofish sharks enjoy a pretty long lifespan of 8 years. And lastly, the latest addition, glofish bettas, live for 3-5 years.
Dalmatian mollies are believed to be the hybrids of the popular sailfin mollies that originally inhabit the freshwater habitats from North Carolina to Texas and the Mexican Yucatan Peninsula.
Mollies have anywhere between 40-100 babies at one time. The number of babies they produce each time is dependent on factors like the mother’s age, size, health, and environment.
I wouldn’t recommend adding mollies to a 10-gallon tank. These fish make active swimmers and produce a good amount of bioload every day. However, if you go by the ‘one inch’ per gallon rule, you can house 3 3-inch long mollies and 2 4-inch long mollies in a 10-gallon tank.
In a nutshell, the most common signs of a dying molly fish are lack of appetite, erratic swimming style, lethargy, panting, visible signs of injury or illness in the body like red or white spots, flashing, clamping fins, loss of balance, and shimmying.
Although black mollies are as hardy as they come, they require special care during pregnancy. Otherwise, your pregnant black molly fish will deliver premature fry that won’t see the light of the day.