The Bio-Wheel is the filtration device that collects the good bacteria to complete the necessary nitrogen cycle; similar to the carbon cycle in our planets atmosphere, which is being overridden by our CO2 introduction into our atmosphere. Point is that without the necessary bacteria that feeds on the Nitrates at the end of the filtered nitrogen cycle, the water will become more toxic for the fish. The plants use the nitrates, it's good for them, so your tank needs some nitrates in the water, but not to much. Like I said, too much nitrate in the water is harmful to the fish.
Running the 10 gallon w/the 'oversize' filter would be alright, as long as you allow the added time for the Nitrogen Cycle to balance itself. Time is money, right, so you can wait longer for the optimal environment for you fish in the 10 gallon, or you can spend the money on one Marineland 100, which wouldn't take as long for the Bio-Wheel to collect the necessary bacteria. Although, nothing would be wrong with buying an additional 100 for your 30 gal - which in fact would still be a little overkill - but then your 10 gallon would become unfiltered because you would transfer the filter to the thirty. It all depends on whether or not you are going to be setting up an environment in the ten gallon as well as the 30. If you are simply giving them a "bigger house" with the 30 then you have no further reason to filter the 10 gallon, because you would transfer the fish.
The whole thing sound like a bad idea if you want to keep your fish alive. Do you care more about your pocketbook, or the fish? It's just risky, and there is little chance that your thought pattern about the two different tanks will ever work, keep the fish alive. Unless you have the time and money to set up the 10 and 30 gallon appropriately, simultaneously then you are being careless with your fish; not to say it's not possible. The fish will be stressed out so much that once they make it, if they make it through the transfer the slightest problem could push them over the edge.
Aquarium Type: Freshwater
Aquarium Size: Mid-Size (20-60g)
answered 3 years, 2 months ago
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You will be fine to use a Penguin 150 on a 10g tank.
answered 3 years, 3 months ago
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