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Onyx Controversy


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."