RE: Phosphate sponges , resins...

Hello,  IMHO and experience throw out those phosphate resins, nitrate 
absorbers etc. You don't need them.  Just do regular water changes 
and good water husbandry and you don't need all those expensive 
gimmicks.  Believe me,  the pet and fish manufacturers would package 
and sell  air if they thought they could get someone to buy it.  Save 
your dough.....  You don't need the stuff.  Mike Bernardoni