08-28-2010, 01:20 AM
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I would try and place the bag inside the filter compartment if possible.
1/4 to 1/2 cup of crushed coral per 20 gal is in my view,a good amount. Rinsing it well before using it should help with reducing cloudiness.
I might consider buying a small cheap filter and remove the filter media, and use this filter along with your present one to place the bag of coral in.
Rinsing the coral well before using can help reduce cloudinesss of water.
Another option is to purchase a small sponge filter and place it in the tank and let it run for three weeks minimum. At this time,you could remove the filter material from the filter you have presently, and stuff the bag of coral into the compartment of this filter if it won't fit now in present filter.
Three weeks would allow the sponge filter to become colonized with bacteria(good kind) and would prevent losing all of your biological filter when you removed the filter material from the Hang on the back filter.
In any event,,you will need to clean the crushed coral under hot tapwater perhaps once a month to remove silt,dirt,algae,and mulm that will collect on it. Otherwise it will become clogged with the afore mentioned substances and become less effective.
Would perhaps swap it out for new coral every three or four months, depending on what water test reveals.