what's better tetra whisper -internal 10-30g, or newer 20i(internal) filters?
wondering what internal filters from tetra-whisper- are best? 10-30g(old school=white box, or 20i(new school=yellow/white box) maybe not best comparison but the prices are close. Any thoiughts from userrs of both products or either one? gonna use for small turtle. the new models have a new bio scrubber (bio media(.... i think. Any help is great and will be awarded. THANX