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If I were to switch one of my tanks to non planted tank, for one of my kids, do I need to use undergravel filter with power heads? This would be fake plants?

Thanks
 

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No, you don't NEED to use an undergravel filter at all. There are other options, all have their pro's and con's. Simple sponge filter with a powerhead works well, see my signature "Cheap filter". UGF's are preferred by some since they are not as visible. But they are harder to clean.

I wonder why plastic plants though... even if it isn't going to be a lush CO2 injected masterpiece, adding a bit of sand and sticking some plants in there can only be good for fish (and people)?
 
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