Hi there. Sorry your goldie doesn't seem to be doing too well. I have a few ideas and suggestions for you.....
Okay, off the top, you should never ever totally break down your filter and clean it spotless. And too boot, you should never do in depth cleaning of filter at the same time as cleaning the rest of the tank. Essentially, what you are doing, is tripping up your nitrification cycle every time. It takes days and even weeks for it to establish itself again. You see, all that brown gunk and buildup in the filter and on the pads are actually what keeps your water free of ammonia and nitrItes. Instead, you should stagger cleaning as much as possible. One week, rinse the cartridge out in tankwater, the next week, clean out a bit of the stuff from the uptube and impeller assembly (intake tube, strainer and the magnetic fan housing). Also, ANYTIME you add a completely new filterpad/cartridge, do not clean anything else in the tank for a week. In doing all of this, you will be preserving the viability of your beneficial bacteria that keeps your water clean. Please note that these tchniques ONLY work when you are providing filtration that pushes ten times the amount of water in the tank, per hour. For a ten gallon tank, the filter needs to push 100gph (at least). In a ten gallon tank with too many fish, you need almost double the gph.
Okay, you say that you have never added any fish to your tank in two years right? I see you have added ghost shrimp before. When was this in relation to the ich appearing?
Have you ever added any live plants or ANYTHING that has previously been in another tank without drying or cleaning?
All it takes is one drop of water from another tank to introduce any number of parasites to your tank. I suspect that the ghost shrimp (or something else) brought the ich in to your tank. This is because ich, once in a tank, can and WILL show itself very quickly, usually within weeks or a month. Although many parasites can sit dormant or breed undetected for many months or years, ich is not one of them. That statement is directed more towards the microscopic parasites we never see with the naked eye. I also suspect that the ghost shrimp (or whatever) may hav brought in another parasite with the ich. This is evident in the amount of time it has taken for them to become prevalent enough to affect the fish. Truthfully, to me, it sounds like flukes. But, that is an educated guess at best.
I would suggest that you re-treat with 0.3% salt for 2-4 weeks. At the same time, feed medi-gold and medicate with praziquantel. All three of these, used together, gives you an
awesome blanket treatment for 90% of the parasites we commonly see in our tanks. All three are also VERY safe to use and WILL NOT affect your bio-filter. You can get medi-gold from here:
goldfish connection and I suggest the brand of praziquantel here:
pondrx the test kits from big Als should also be a priority as Devs has suggested.
I realize that this may not be cheap but it is truly your very best bet in tackling this problem. Remember, swift and sure is the best way to deal with parasites so try to get these meds and tests ASAP.
Until you can get the medications, I highly suggest salt dips as a way to control this infestation until the big guns arrive. here is a link to a page on salt dips for bugs:
salt dips for flukes and other parasitesAlso, here are some very important links to some pages that will help you greatly in understanding the basic principles in keeping goldfish happy:
Keeping Goldfish (by Emmahj)Cycling tanksFilters and maintenenceSo, It looks as though you have a little reading to do. When your done, I'm sure you will have some questions. Please don't hesitate to ask anything that needs clarification. Thats what we're here for!
Post back soon.
Paul