Mandarin's tail!

What other tankmates do you have? It could be that he's getting agitated with lack of swimming space and picking on the easy targets. Although a Mandarin has a slime coating which is supposed to have a foul taste, it won't stop the wrasse from having a go at him. My mandarin leapt out of my tank to get away from my wrasse. In the end I got rid of my wrasse.
 
I have 3 wrasses in my tank and none bother anyone - a Lunare, 6-line and Radiant. Perhaps I just have 3 exceptionally well-behaved wrasses but they don't chase or nip at anyone, aside from the Lunare that goes insane at feeding time and accidentally nipped the radiant as it swam right where there was a bite of food.
 
I think wrasses fall into the group "there's always one"! My sixline was an aggressive thing to quite a few of my tankmates, but I knew they could be and it was a risk. I would love to see s picture of your Lunare Mandy, they're one of my favourite fish but I daren't rish one in my tank.
 
Hi there...could be fin rot...here is some info I copied and pasted from a website.

Disintegrating fins that may be reduced to stumps, exposed fin rays, blood on edges of fins, reddened areas at base of fins, skin ulcers with gray or red margins, cloudy eyes.


Tail and fin rot appears to be a bacterial infection of the tail and/or fins and may be caused by generally poor conditions, bully, or fin nipping tankmates. If aquarium conditions are not good an infection can be caused from a simple [COLOR=blue ! important][FONT=Arial,sans-serif][COLOR=blue ! important][FONT=Arial,sans-serif]injury[/FONT][/FONT][/COLOR][/COLOR] to the fins/tail. Tuberculosis can lead to tail and fin rot. Basically, the tail and/or fins become frayed or lose color. Over time the affected area slowly breaks down.
First, attempt to ascertain the cause. Then treat accordingly. Also, treat the water or fish with antibiotics. If added to the water, use 20 - 30 mg per liter. If the fish is to be treated add an antibiotic to the food. With flake food, use about 1% of antibiotic and carefully mix it in. If you keep the fish hungry they should eagerly eat the mixture before the antibiotic dissipates. Antibiotics usually come in 250 mg capsules. If added to 25 grams of flake food, one capsule should be enough to treat dozens of fish. A good antibiotic is chloromycetin (chloramphenicol) or tetracycline. If you feed your fish [COLOR=blue ! important][FONT=Arial,sans-serif][COLOR=blue ! important][FONT=Arial,sans-serif]frozen [/FONT][COLOR=blue ! important][FONT=Arial,sans-serif]foods[/FONT][/COLOR][/FONT][/COLOR][/COLOR] or chopped foods, try to use the same ratio with mixing. As a last resort add at most 10 mg per liter of water. Also, if unkempt conditions are the suspected cause, correct it.
 
I think wrasses fall into the group "there's always one"! My sixline was an aggressive thing to quite a few of my tankmates, but I knew they could be and it was a risk. I would love to see s picture of your Lunare Mandy, they're one of my favourite fish but I daren't rish one in my tank.

Sorry, it's off topic, but since it's not mine there was no point in starting my own thread... I haven't yet caught a picture of my quick booger that's not a streak of blue. he's from the Red Sea so different colorations (and a lot more expensive) than the average Lunare. Looks exactly like this guy from Live Aquaria's Divers Den. I've attempted to get a pic of the beast, but he wants nothing to do with it.

Lunare.jpg
 
ah man! ya i think the puffer ate my fire shrimp today and the wrasse joined the feast.

ever since i introduced krill he started getting crazy for meat...whoops...should have just left him on his red macro diet. > _<
 
AquariaCentral.com