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Self Help - Answers to Common Reefing Questions & Problems

Ick - The Truth About It

Ick, short for Ichthyophthirius, is a parasite found in EVERY aquarium.  Let me repeat...Ick is in all of our tanks all the time.  When a fish is infected it is commonly seen as tiny white dots about the size of sugar grains.  Every hobbyist, whether freshwater or saltwater, has either heard of, has experienced or will experience Ick.

The Ick parasite is as common to the hobby as the cold virus is to human beings.  Why don't we walk around with a cold all the time?  When our immune systems are healthy we ward off being infected.  The same goes for fish & Ick.  Ick is present in all oceans but in such low numbers (due to the vastness of the oceans) the fish can easily ward off infections.  In our aquariums however, the dense population of fish in an enclosed environment allows Ick to quickly take hold & spread.

What causes Ick?  Quite simply...stress.  Stress lowers a fish's immune system making them susceptible to infestation.  Let’s look at the Hippo Tang who has a reputation for being an “Ick Magnet”.  Why is this?  Because this fish has a more nervous personality than most & nervous = stress.  Stress can be caused by one or more of the following:  collection, transportation, poor handling & holding systems, poor water quality, improper diet, bully tank mates, stray electricity in our water...and the list goes on.

How to remedy Ick?  First let me stress that prevention is the best medicine but if you see Ick on one or more of your fish you need to identify the stress & eliminate it immediately.  Also of huge mention is that as of this time I write there are NO known safe & effective medicines we can use in a reef aquarium.  Be careful of false claims!

There are those who suggest that freshwater dips will help.  I disagree!  Understand that the Ick parasite is protected under the fish's slime coat.  It's only when the parasite goes off the fish that any remedy will work.  Freshwater dips IMO only make matters worse!  Imagine the additional stress to the fish from being netted then dumped into freshwater only to be placed back into the aquarium ... now with an even lower immune system!!

Again, find the cause(s) of stress & remove it.  If yours is a case of transportation stress (you just bought a new fish & introduction to it's new home stressed it) and only a couple spots have appeared on the new fish...I would not worry.  As long as any infected fish is eating and you don't see the Ick spots increasing in numbers, the fish can easily get over the infection.  Think of it like us humans either having the sniffles or full blown pneumonia.  A couple of spots (you can count them) = sniffles.  Peppered with spots (can't count) = pneumonia!  If the fish is peppered you may want to consider intervention by means of Hyposalinity.  Hyposalinity is where we lower the salt level in our tanks to a therapeutic level, usually between 1.014 & 1.016 and raise our tank temperature to about 80 degrees.  Understand that the Ick parasite cannot tolerate salt levels below a certain point.  Lower than they can tolerate kills them!  Raising the temperature actually speeds up the life cycle of the parasite making it come off the fish faster.  Ick is doing the most damage while on the fish.

If you decide that hyposalinity is needed then you will want to remove at least 10% of your tank water & replace with fresh water.  The next day check the salinity & adjust as needed to get it to the therapeutic level.  Leave the tank in hyposalinity for 2 weeks.  If no spots are seen at that time you can increase your salinity slowly by replacing evaporation with saltwater.

Understand that hyposalinity can be hard on corals and inverts.  Many corals will close during this time.  You may even loose a coral but usually that's not the case.  I've have personally used hyposalinity many times successfully.  There is no quick fix or exact cure.  Again, the best method & medicine for Ick is prevention = no stress.  For more information see "Self Help" Fish Stresses = Disease = Death?


Back to Self Help Topic List

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