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When I first started in this hobby one of the "rules" was that a stable
aquarium environment should be maintained at all times, because that was what
the plants and animals were accustomed to. Definitely no limestone or clam
shells, 'cause they dissolve, etc. Now a known dissolver is being touted as
the next, best substrate or something close to that.
That brings to mind the "rules" about changing aquarium water. In the early
years, as reported by Dr. Innes, experienced aquarium keepers never changed
their water and enjoyed its brownish hues. Then came the clean water era,
when frequent water changes were the rule, and now some authorities, like Ms.
Walstad, suggest that partial water changes occur no more often than every
six months or so.
"The more things change, the more they stay the same."