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Can you reduce the suction if the small hose by kinking it slightly? I usually try to get more suction by avoiding kinks with a big hose, but it should work the other way around.

Do a new one each time. The main reason is that this will keep exactly the same chemistry and temperature in the bath as the fish is used to in the tank.

Feel free to do much less! You are trying to stress the parasite to death without harming your fish so a very conservative approach is a good idea, certainly for a first treatment! Also use old tank water so the fish doesn't have to endure much temperature change.

Sorry about that! Do test your water as it is very possible that nitrates are building up to unhealthier levels. Fish can slowly acclimate to higher levels of nitrates that new fish can't tolerate.

liveaquaria.com suggests a 150 gallon tank minimum with excellent filtration and that as a carnivore, this fish will tend to harass smaller fish. Tropical Fish for Freshwater Aquariums: Black Ghost Knifefish It's a beautiful species!

PWC is a partial water change. Change 25 to 50% and see if that helps. You should also test for ammonia, nitrites and nitrates to look for reasons the new fish might be stressed.

Half a tablespoon of salt. Make sure it's aquarium salt or kosher salt as iodine or anti calling agents can harm your fish! I've read that you should leave her in the bath for up to half an hour, but watch carefully for any strange behavior! If she swims frantically when you out her in, take...

I'm not sure how long it will last or what factors might influence that. I'd be interested if you can let us know when it stops!

That's sperm and you might see eggs too. I don't have personal experience but I've heard it will rot and overload your biofilter without major water changes. Can you move the urchin to an isolation tank until it quits trying to reproduce?

Could you link to some of the fixtures or LEDs you're looking at? That'd help me give useful advice! I'm not trying to be obtuse, but you can't usefully specify aquarium lighting in watts of electrical power any more -- this hasn't been possible since incandescent bulbs were replaced by...

Unfortunately it doesn't make sense to talk about watts of light because different LEDs have different efficiency and they can be driven at different levels largely depending on heat management. You can look up PAR levels for common fixtures or estimate it based on lumens which are easier to...