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#2
08-17-2010, 12:00 AM
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certain gasses can become trapped under the sand (i'm assuming you have sand) and if it's not dispelled regularly and then suddenly released it consumes the oxygen and the fish suffocate. By adding an airstone you guarantee oxygen for the fish...the only other thing you can do is add an annoying HOB filter that tricles into the tank and creates oxygen that way.
I personally never vaccum my sandbed...the plants are so numerous and the trumpet snails are everywhere so I don't do anything for it. Just the normal water changes and even those are few and far between because it is a heavily planted tank. 
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#3
08-17-2010, 02:05 AM
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I use an aquaclear filter because it agitates the water and adds oxygen.
Now i also added a koralia incase the aquaclear stops. In the past in heavilly planted tanks I used an air stone but only at night. I don't care for the bubbles that much. I just ran the air pump oposite to the lights.
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72 Gallon Bowfront Reef.. Hardware:2x250w Luminex Elite HQI Reflectors (Phoenix Hexarc Bulbs), Galaxy 2x250w Electronic ballast, Euroreef 130 Skimmer, Sedra KSP 7000 Retern... Live Stock: Pair of Hawaiian Flame Wrasse, Leopard Wrasse, Pink Streaked Wrasse, Pair True Percula Clowns, Potters Angel, African Flameback Angel, Orange Fin Tomini Tang, Yellow Assessor, Tailspot Blenny, Purple Firefish.. 45 G FW Asain Barb Community tank.
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#4
08-19-2010, 03:00 AM
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like Wingin It said, i can almost say for sure that it was the vacuuming of the gravel that released ammonia and what not into the water which starved the fish of air. I personally do water changes 2 times a month. and have a bubble stone in the tank to keep the water airated.
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#5
08-19-2010, 06:00 PM
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Had the same happen and after tested the water and the ammonia spiked to over 30ppm. The guy I spoke to is a marine biologist and he said that when I stirred up the gravel that much I took out all the bacteria that controlled the ammonia causing it to spike to toxic levels killing most of the inhabitants. Now I never stir the gravel during water changes.
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