10-26-2011, 09:13 AM
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When you consider all of the variables, there really can't be a rule of thumb regarding adding new stock...
> New tank, recently cycled or established.
> Water chemistry.
> Size of the tank.
> Condition and maintenance of tank and substrate.
> (Bio) Filtration.
> Existing bio-load - proposed new bio-load.
> Feeding amounts and methods.
Any one of the above (and others I haven't thought of here) leaning on a negative side totally changes the equation. We must use our best judgement and better to err on the conservative side than to throw money away and torture poor defenseless fish.
If we have an established eco-system and make changes in stock, filtration and/or maintenance, we need to perform water tests and/or observe stock to better ensure against negative reactions. If/when there are negative reactions to change(s), we need to be prepared to perform corrective action(s) quickly as needed.