Hi

Im Anneliese 18, from Australia, Im new here, -and Im a chronic fish killer. I dont even name my fish coz i know they're going to die!
I had some goldies a few years ago, but they died, -at the time i didnt want any more, -but this year so far ive been pretty lonely so i got some more - 3 fantails-of which two died -which i believe was something to do with the perriwinkle shells i had on the bottom. (they bleached) -and im puzzled as to the latest deaths. -though its probably something to do with the whole 'nitrite/nitrate' cycling the tank thing, -(i didnt do chemistry, and it confuses me. ) anyway, I like to clean out 99% of the water every week. coz i like it clean. -and if i dont -they die! -i should probably get a filter. I have a corner one -but it took up half the tank and made the water dirty and full of filter material.
I would really like someone to help me, -also im having trouble working out how many fish i can have, my tank is 10inches long, 5wide and 8 high, and i think that means i can only have 1? -im confused with the whole gallon thing. (yes i suck at maths too!)
Right this second i have my last fish in a glass. What do i do with it?! -the 2nd fish acctually started breathing again when i put it in warmer water. -but it still carked it.
Please help.