Hey everyone,
Can't answer all the required questions, but the tank is roughly 15L, has been there for about 2 years. Water gets changed fortnightly. Only 1 fish in the tank, feed fish goldfish flakes, sometimes stays at the bottom and moves around slowly (sometimes) and I add a multi cure treatment for some bacterial and fungal diseases. Anyways, my fish has these odd bubbles near his tail. Has anyone seen these before or know how to treat them? They came once before but went within a couple of weeks but it's had these a while now.
Thanks

Couldn't be a female laying eggs could it.Just bubbles look like fish eggs.Hopefully someone else will be along soon to take a look and be able to tell you.

Welcome to Koko's

That tank is definately bigger than 15 litres, are you sure you don't mean gallons? I'm sure somebody will be able to help you out soon

Hi carlito_1985,Welcome to the forum.Is the tank actually 15Liters or 15gals?
I was having a hard time seeing these bubbles in the pics-Can you explain them more to me?
I also want to say that cleaning the tank,should be done on a weekly basis,along with a gravel vac to help keep things going okay. If that is a 15 litre tank,one fish can have the water params messed up in no time.Have you heard of the water testing kits that you can get to test your water? We consider those Kits a "Must Have" around here.They let you know exactly what's going on in your tank without any guessing on the whys. 9 out of ten times a fish is sick,has to do with poor water quality.Any time that you see odd behavior,you may want to remember that and change out at least 25% of the water---(make sure that it's temp matched and treated),and see if it helps.
Is your fish showing any other signs/symptoms---red streaks/torn/frayed fins/gasping/Red spots,etc?
I would also be careful adding all those meds unless you know what the problems are for sure,especially in poor water.If your water's out of whack,most times the meds won't even work.
This fish is looking pretty fat,how many times a day do you feed it--Do you sok flakes in a bit of tank water before adding? Have you seen this fish poop lately?What did it look like?