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- toronto, canada
well, imo, appearance wise, sponge and corner box filter's are the same- utilitarian. but, it is easier to split media when using corner box filters to start another tank. as far as whether they work, i had 2 discus in a 30 for a couple of months, and it kept up fine, with no health problems at all. in fact they both laid eggs on the filter. imo, if they will work for 2 discus, they will be sufficient for any realistic number of apistos, etc. the thing i do is, i put some gravel or ceramic noodles in the bottom to keep them them down, then floss, then a little piece of aquaclear sponge. however, what media you use is likely not that important, anything will work. i do find that when i clean them, i can get them much cleaner than a sponge, due to the fact that you can get a lot more stuff out than with a sponge. the media is 'thinner' if you know what i mean.
rick
rick