Depends on what fish you have but i say put in a almost complete screen of floating plants that should help a lot though i may be overlooking somthing. if you have mbuna they may eat the plants. Hope that helped.
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Tanks, 16gal, 8gal, 35gal, 200gal pond, T. candidi hospital tank 1 gal.
A. sp. abacaxi, A. agassizii, A. gibbiceps (2 strains), A. pertensis(?), A. pacisquamis, A. sp, A. hippolytae.