A properly working filter can really improve the living conditions for your goldfish and will almost double the tanks holding capacity. The tank you have though is not large enough for any kind of goldfish. 1" of fish needs 1 gallon of water. Your goldfish will grow to around 10" if given reasonable conditions. That is going to max out your tank with just 1 fish.
A common goldfish can be bred with a red cap oranda fish. When these fish breed, there is a definite courtship ritual.
No, I wouldn't recommend it. Bettas can be very aggressive, hence the name Siamese fighting fish.
Aslong as it has enough room and filtration many types of goldfish can be kept together. There are some cases where problems occur as such as the case with Sarassas and Orandas. Sarassas will tend to nibble at the cap of the Oranda causing damage.
To breed red cap oranda fish, create a breeding tank with good water quality and plenty of hiding spots. Pair a male and a female, and provide a spawning medium like plants or a spawning mop. Maintain the water temperature around 75-80°F and feed them a varied diet to encourage breeding.
Overflow tank only
The radiator doesn't have a cap. The overflow reservoir tank has a cap instead. (Tan plastic tank on passenger side)
It uses the cap on the coolant recovery tank as its "radiator cap".
If it has a coolant tank, that's the "cap".
If you have a threaded cap on your coolant reservoir that is your " radiator cap "
no cap, there is only a cap on over flow coolant tank. to add coolant add to tank make sure it is at the right level when cold.
No. It means the cap is not on tight enough. The coolant tank could also have a leak.