"As for biomedia, I opted for a Taiwan classic when filling large sumps and trickle filters, large round brushes. These have great surface area, you can fit many in together, the metal doesn't rust and has an added bonus that it keeps itself pretty much as clean as needed to work well, i.e. doen't clog. This is the brush, each measuring about 48cm long by 13-14cm "
we used these inside koi pond Filters... not bad but we mounted them up and down not laying like some ppl think... GL and nice fish... are thoses plants going to sink or stay like that?