If you change 20% water every week, you avoid major problems in water.

For your 30L aquarium, a 5 liter botle should be fine.
When removeing the water, dont remove from top of aquarium, but do it from bottom/depest possible so that you can clean it at the same time.
[Reply]

I personally will think a lot less of you unless you have an opening treasure chest, a skeleton with the sword in it's chest that sits up and down, and the rising-falling UFO as decorations in your tank (they run off air from the pump).

Also, a castle.
[Reply]

I was thinking along the lines of a sunken galleon, opening treasure chest with a skull in it, volcano for the bubbles and a scattering of dubloons along the bottom. Forget the fish - their boring!
[Reply]

Definitely. And with that plan you should never need to clean the tank!
[Reply]

Seems like a lot of unneccesary effort just to keep fish.
Why not buy them fresh from Asda on the day you want to cook them?
[Reply]

We picked up some tiger barbs on the weekend and popped them in the tank - they seems to be getting on great. Then we went out and got fish and chips from a restaurant and ate them without the slightest feeling of guilt!
[Reply]

Yeah, every fish tank needs 'Mount Wanahokaloogie'
[Reply]