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What are the definiton of economics according to walstad and bingham?
Wiki User
∙ 11y ago
A social science concern with using scarce resources to obtain the maximum satisfaction of the ulimited material wants of the society.
Wiki User
∙ 11y ago
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When was Ole Christensen Walstad born?
Ole Christensen Walstad was born in 1799.
How long after cleaning a fish tank can you use algae cleaner?
In a proper filtered aquarium that is properly stocked and has completed the nitrogen cycle you should be doing 20% water changes once a week. In heavily planted and very lightly stocked tanks you may get away with once a fortnight. If you're keeping very messy fish such as Plecos or Goldfish then you may need to do twice a week! In an unfiltered bowl you would need to do it several times a week, but no fish should be kept in an unfiltered aquarium unless you are following the Walstad Method, which is pretty complex and technical!
How do you keep fish from dying in a fish tank?
When starting a new aquarium sometimes it is best that before you put any fish in it that you let it cycle (let the filter and other equipment run) for about a week or two. This helps the good bacteria needed for fish survival to build up so that when your fish is added it doesn't struggle with building it up himself.
