I have a 25 litre tank, in which I previously kept two comet goldfish. I had no idea about cycling the tank and just chucked them in (My boys won them at a fair, that's another story, I wasn't with them at the time). They (the fish) lived in there with no (apparent) ill effects for 6 months. I added tapsafe to the water, but never tested it in any way. They also had a filter and a couple of plants that died pretty quickly. They grew quite rapidly (probably because I overfed them, they begged for food endlessly), so I transferred them to their (my boy's) Grandad's pond where they are thriving, and doubtless much happier. I decided that I would keep tropical fish in the tank so I have been researching loads, and discovering that I committed every fishkeeping sin with the goldfish! I was going to do it right this time. I was going to have 4 tiny fish and some cherry shrimps. I set up the tank with a new filter, river sand, water heater, bogwood and plants attatched. The PH was high so I adjusted that and added API quick start. The water was cloudy after a day so I took everything out, boiled the bogwood and sand, cleaned everything and put it all back in. I did the same again and now the water is yet again cloudy, the bogwood has white fungus like spots on it, the plants don't look too happy and the water stinks!! I haven't even got any fish in it. Why is it that when I had goldfish in it, and I was apparently doing everything wrong, the water was crystal clear, and now I'm doing everything 'right', it's all going wrong? I'm waiting for some ammonia to arrive, but to be honest, I feel like giving up. I've spent so much money too. Any ideas as to what's going on? Any advice appreciated.