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post #1 of (permalink) Old 10-19-2020, 10:21 PM Thread Starter
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Biological Filtration Survey

I am about to redo the filtration on my 120 planted rainbow tank from scratch. I *want* to ditch my two Eheim 4+ 600s in favor of one strong external pump (that will branch off to various returns for flow purposes) and a Nu-Clear mechanical (with option for carbon or Purigen) filter.

QUESTION: In our planted tanks, with (in my case, 2” of) black blasting sand covering my 18” x 60” footprint, do I need a BIO filter? The Nu-Clear would be an outstanding mechanical filter, powered by a strong external DC pump, where the retur flow is branched with ball valves three ways: 1) run with an inline Vecton 2 600 UVS, and 2) provide flow to my CO2 cerges and 3) boosted flow throughout the tank.

In this plan, there would be no biological media in a filter. The sand would house the biological bacteria needed to control ammonia. My tank is mature: it’s been running since May of this year.

Anyone do this currently? Anyone go without biological media and just use their sand for that? (I feel like someone said they did...)

Tanks a bunch!

My current 120 tank journal:
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