trickle filters are usually used by marine tanks as the purpose is to slow down the water flow in the sump so that nitrifying bacteria can start to colonise the media (bio rings or other materials). The only problem with trickle filter; or rather problem for planted tanks are that it creats too much oxygen exchange, rendering your precious CO2 useless.

However, I know of some planted tanks that have begun using the trickle filter system; not the most ideal systems, but plants are flourishing well. What can you say? We will always try our best to manage what we have.

For the algae problem, its always never ending. Perhaps you may want to reduce yr nitrates as what khoo says and maybe try installing a UV light above yr tank to eliminate the algae. Bear in mind it does not eradicate yr algae, but help to control it to a manageable level.