Two books I highly recommend are:

Fish Disease: Diagnosis and Treatment by Dr. Edward J Noga.

Captive Seawater Fishes: Science and Technology by Dr. Stephen Spotte

While not the easiest reading, they are both superb.

Both books are somewhat expensive but are well worth the money.

Sea Urchins

Scientific Information:

Phylum: Echinodermata
Class: Echinoidea
Order: Multiple. See below

Common Names:
Pin Cushion, Tuxedo, Long Spine(v), Short Spine, Pencil(sn), Flower(vv), Fire(vv), Sand Dollar(sn)

v = venomous
vv = very venomous
sn = special needs

Origin:
Pin Cushion - Caribbean
Tuxedo - Indo-Pacific
Long Spine - Indo-Pacific
Short Spine - Indo-Pacific...

Garlic must assuredly be a proven method of disease treatment. Why else would so many reputable manufacturers make and market a cure if it had not been scientifically proven?

Taking these points in order, first garlic has never been conclusively proven to cure Marine Ich (Cryptocaryon irritans), ever. Some hobbyists have used it and reported that their fish got better, but these are not controlled studies and none of these hobbyists know for certain if their fish's own natural immunity...

I recommend you avoid garlic, I stopped using it....

OK I'm a no garlic for marine fish person.
Why?
Well firstly let me give you a little background on where I’m coming from, I’m a fish disease research scientist and I specialize in fish vaccination and ectoparasite infections in fish. I don't work for, sell or am I in anyway assciated with commerical fish food production. My research laboratory has carried out many trials for fish feed manufactures on garlic, both...