This is a bit mad considering its now been decided that im gunna cycle my tank with a big anemone and its clowns plus a few crabs etc.
Dont suppose it will be a prob thou unless he leaves bits of his feet on the rocks that grow to be monsters do you?
Heres a pic of the fella, he's a mates who needs time to rebuild his tank and think what to do with him since he found out its a different species than first thought. It is already killing corals it touches and is likley to grow up to a metre long.
Its about 15inches at the mo, to give you some perspective.
do you actually have to inject them with a needle? could i just use a flavor injector or a baster? i don't have my octo yet and i'm really not worried about hurting anything else in the tank (just hermit crabs and turbo snails) so could i just squrt the hot water directly at it?
No, you have to inject them. Get a needle used for injecting insulin or a glue syringe. I use distilled water - bring it to a boil in a 3 quart saucepan, rush it to the table by the aquarium, fill the syringes and stab and inject the rock anemones. This won't hurt the other inhabitants of your aquarium if you limit the water to four or five syringes full at a time.
There are some substances you buy, the latest being Joe's Juice I think, that you just squirt on them.
Joe's Juice is widely available in reefkeeping stores/circles. About 10 bucks USD for a small bottle. Used to use it all the time myself in my reeftank until we picked up a fish (copperbanded butterfly) that is an anemone/aiptasia predator. Although I've no experience with octopii--I'm just here researching and contemplating the possibility--I doubt you'd want a CBB fish in an octopus tank, though! Very expensive snack for the octy...