damsel in distress

[fishtails]

My lemon damsel has recently developed a white "flake" on the top of his head,near his fin.As I can recall he didn't have it Saturday,and i did add two emerald crabs and some of their water got into my tank.Could their water have had a parasite or disease in it?(I know it could've)Also he like to dig in the same spot in the sand,even when I fix it.but I dont think hes scratching he just likes it.I'm also battling cynao and I added a seagel filter about a week or so ago.Will this work?Also my perc.clown scratches himself on the heater every now and then but my other clown shows no problems.Am i most likelyhaveing some kind of disease?What could it be?It may be the water permiters but I need to have them checked because I dont have a test kit.All info. is appreciated.Alex

 

[beth]

Start feeding your fish garlic soaked food just in case you have a mild parasite problem. If a real problem develops, such as ich, you will need to set up a quarantine tank to treat your fish.
Improved circulation in the tank will assist with cryno. Also, many snails will eat this.

 

[fishtails]

Whats' the best snails for eating red/slime(cynao)algea/bacteria?I have turbo's,hitchikers,and astreas'.I also have some emeralds' who are doing great so far.(since added saturday)red legs,blue legs,and a peppermint shrimp. Also which type of garlic would you recommend?
-Alex

 

[beth]

Cerith snails will eat cryno. You can used fresh garlic, crush it and allow the juices mix in with the food. Or you can get a garlic extract sold for hobby application. Kent sells one of these products.