Hi everyone
This is my first time here, just registered. I am totally new to keeping fish and really need some advice. The main problem is that I have so much conflicting information that I don't know if I'm even doing the basics right.
I bought a 21 litre "goldfish learner kit" from the pet store about a month ago. I followed the assistant's advice on 'cycling' the tank, introducing fish, etc. We have a small Black Moor and a small Blue Fantail. All seemed to be OK and apart from a few murky water days which cleared up after water changes, it's gone OK. Until two days ago when the Black Moor got some white spots which got worse the following day. Seeing they were of a 'cotton wool' texture, I worked out it might be a fungal infection. I did a water change which perked him up and cleared up some of the spots instantly and then added some Wunder Tonic yesterday. This morning he is back to more white spots and he's sitting at the bottom of the tank, hardly moving for most of the day. And now the Blue Fantail has started acting oddly, hovering near the top of the tank.
I now realise that the tank is way too small for fancy goldfish - which is annoying when the box states that it's for goldfish and the pet store assistant said we could have two fish in it! Anyway, I can't afford a new tank so will have to try and make do for now. It has a filter that sits on the side of the tank and has a charcoal and wool filter plus a biogrid. The instructions that came with the filter were terrible and I was mistakenly cleaning the biogrid each week when I think I was supposed to just leave it be. I've been adding "good bacteria" each week and doing a 25% water change also. Previously, I wasn't conditioning the new water properly (I didn't know I had to wait for the water conditioner to work before I added the new water to the tank - darn instructions!).
Specifically, the things I need help with are:
1. Should my tank have a pump as well as a filter (for the oxygenation of the water)?
2. As I have a charcoal filter will my tank actually be cycling?
3. When I do a water change I am removing most of the water so that I can filter out the waste (they are goldfish, they poop a lot!) and then returning the water to the tank. Should I just remove the 25% and leave the remaining water in the tank in the hope that the filter or bacteria will remove the waste? Perhaps I'm doing TOO much!
4. If these little guys don't survive what type of fish would be suitable for this size tank?
5. Is there anything I can do now to try and help the sick fish?
Help! (and thanks)