i was running my bioforce using a 750 bilge pump just to test it, i
like how it worked but now as i expected the pump is near broke.
do bigger or smaller pumps give longer life or does this not matter? i
could get bigger versions because its a river tank but these are what
im considering:

titan 550, capable of pumping solids and requires no prefiltering.

pondmaster mag-drive pumps 500 gph

eheim 1250 317 gph, i've heard eheims are very good but that they are
better for circulation and not for preasurized filters due to it being
designed for circulation..

if someone with more experience in this could give their advice i
would greatly appreciate it. also is there any benefit of having an
external pump instead of internal?