Help ridding tank of leeches

Well, I made a booboo. I went fish collecting in lake Pontchartrain in LA and found many great specimens, including sheepshead minnows, baby cocahoes, countless grass shrimp, flounders, crabs (blue and stone), nerite snails, and naked gobies. They were caught in water at 1.002, slightly less salty than my tank (1.003). I also collected salt tolerant val, grass of some sort, and hornwort. It all goes well with my previous inhabitants, a fire eel, 3 knight gobies, a juvenile dat, a crazy fish (butis butis), 2 flag fish, 5 glassfish, a fig 8, and a pair of kribs.

Everyone has done well (3weeks now), but I am now noticing small leeches on many of my fish's caudal fins. The leeches are quite thin, about 1 mm, and about 1 cm long. I have caught one fish and scraped the leech off without difficulty, and it is definitely a leech. My tank is heavily planted and full of drift wood, and at 110 gal, it is not easy to catch speedy little fish.

Any thoughts on leech eradication? I have raised the salinity to 1.006, but without apparent effect. I am also now dosing with melafix as a preventative aggainst any other probs that may be lurking.

I have learned my lesson about quarantining now, I just hope my fish don't pay the ultimate price. . I really should know better after 8 yrs of keeping a tank, but I've never had probs with store-bought fish. I shouldn't have risked it(obviously) with wild -caught.

Well, I tried something. . .

I decided to go with a product called paragon by aquatronics. Most of the posts I found on the web regarding leech control were on pond forums, and the most recommended product is called dimulin. It is a powerful anti-chitin product that is used for anchor worm outbreaks and also kills leeches. Unfortunately, I have many invertebrates in my tank, including the crabs and snails, as well as a healthy population of scuds.

So I decided to go with the paragon, which only carries a warning for salt water inverts, though for salt water twice the fresh dose is recommended. The active ingrediients are Dimethyl phosphate and nitrofurazone (I presume these are the anti-parasitics), and three antibiotics (Isonizid (anti TB), neomycin, and kanamycin sulphate). THe recommended dosage is 1 tsp per 20 gal every other day for a min of 3 doses.

I put in half fresh-dose for two days, then removed the snails and crabs last night, then added full fresh-dose. I hated to remove the inverts outright, only to reintroduce any buggers when returning them to the tank. They remain in quarantine at half dose. Well, I missed two crabs, which were belly up in the tank this am. The leeches look a little palid, but for now are hanging on. I'll add the final dose tommorow night and hope for the best. If no luck, now that I have all the main succeptible inverts out, I'll go with the dimulin. The scuds be damned. . .