My Hill Stream Loach Hate My Cory's!

[xamy_valox]

Yeah it is the same ones as I have, and the same issue as its the Sterbai that I have most recently added which are obviously small at the moment that they seem to attack.
I'm unsure as to wether it is both or just the one that seems to be aggressive, I'm thinking its maybe only the one. Maybe it is male and slightly more aggressive, I have no idea.

They seem to be all over the glass, wood and rocks eating all day long, but maybe they aren't getting enough and feel they need to eat the wafers and catfish pellets as well, and are fighting off the cories. It does only really seem to be when there is food around.

One of my cories has been going crazy recently, flicking about as fish do when they have white spot, but to an extreme. Yet 2 seconds later its swimming around find, ferreting for food? I have checked really closely on him and all of my other fish and can see no evidence of ich, but should I treat the tank just incase?

I'm always wary of treating the tank for something incase it does more harm than good?

 

[mikev]

Yes, Sewellia males are more likely to be aggressive.

'flicking' can be caused by other factors than Ich. for instance, there are other protozoan diseases that are harder to see (velvet) or nearly impossible to see (dinoflagellates). They may arise by themselves and tend to take longer than ich to kill fish due to smaller size of parasites. The treatment is the same as Ich but may take longer/more effort to eradicate. Another possible causee is bad water quality or chemical contamination. hth.

 

[xamy_valox]

Well I always test my water before a water change to ensure everything is up to scratch which it was today, PH 7.8, Ammonia 0, Nitrate 5, Nitrites 0.
I have treated the tank with White Spot Treatment regardless as more than one of the cories are flicking and one of my hillstream loaches are acting weird now too =\

Its as if he can't stick himself properly to the glass, like he sticks himself then slowly falls down. Then goes a bit crazy and stays still for a long time. Anyone know what could be causing this? The temp in the tank is a consistent 26 degrees and it has a high filtration as its 125 litre using a Fluval U4 filter.

 

[mikev]

Unfortunately, not a symptom that allows to pinpoint the disease. The fish is obvioulsy weakened, but the underlying cause can be anything: bacterial, protozoan, internal parastires, or simply the aftereffects of the stress during shipping or improper handling by the exporter/importer.

Given that you said you have the fish for a few weeks, if this is a disease it is more likely to be internal parasites (take longer to develop than other types of infection) so I'd treat for those (flubendazole) and perhaps for bacterial causes as well (furan2 is my preferred med for these issues) Probably too late for the weak loach but may save the other fish in the tank.

Good luck!