If the fish are from areas that have tannins during certain times of the year or year round, then I would think it's beneficial to have some amount in. It could be the one thing missing for fish like oscars that get HITH. Tons of reading on it.
Humic substances. Part 2: Interactions with organisms. Meinelt T1, Schreckenbach K, Pietrock M, Heidrich S, Steinberg CE.
- zleibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
Humic substances. Part 1: Dissolved humic substances (HS) in aquaculture and ornamental fish breeding Meinelt T1, Schreckenbach K, Pietrock M, Heidrich S, Steinberg CE.
- leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
Humic acid and moderate hypoxia alter oxidative and physiological parameters in different tissues of silver catfish (Rhamdia quelen) Riffel, Ana P; K; Saccol, Etiane M; H; Finamor, Isabela A; Ourique, Giovana M; Gressler, Luciane T
- Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology184.4 (May 2014): 469-82.
Dissolved organic carbon from the upper Rio Negro protects zebrafish (Danio rerio) against ionoregulatory disturbances caused by low pH exposure; Rafael M. Duarte, D. Scott Smith, Adalberto L. Val & Chris M. Wood
- Scientific Reports 6, Article number: 20377 (2016) doi:10.1038/srep20377 Published online: 08 February 2016
Can dissolved aquatic humic substances reduce the toxicity of ammonia and nitrite in recirculating aquaculture systems?; Thomas Meinelta, , , Hana Kroupovab, , Angelika Stübera, Bernhard Rennerta, , Andreas Wienkec, , Christian E.W. Steinbergd
- Martin-Luther-University Halle-Wittenberg, Medical Faculty, Institute of Medical Epidemiology, Biostatistics and Informatics, Magdeburger Straße 8, 06112 Halle (Saale), Germany
The Use of Aqueous Humic Substances for in-situ Remediation of Contaminated Aquifers; D.R. van Stempvoort, S. Lesage, J. Molson
- National Water Research Institute
Role of Humic Substances in the Complexation and Detoxification of Heavy Metals: Case Study of the Dnieper Reservoirs; P.N. Linnik, T.A. Vasilchuk
- Department of Hydrochemistry, Institute of Hydrobiology, National Academy of Sciences
Use of Humic Substances to Remediate Polluted Environments: From Theory to Practice; Irina V. Perminova, Kirk Hatfield, Norbert Hertkorn
- Proceedings of the NATO Advanced Research Workshop on Use of Humates to Remediate Polluted Environments: From Theory to Practice Zvenigorod, Russia 23–29 September 2002
Mitigating Activity of Humic Substances: Direct Influence on Biota; N.A. Kulikova, E.V. Stepanova, O.V. Koroleva
- Department of Soil Science, Lomonosov Moscow State University
Cytotoxic and Radical Scavenging Potential of Indian Almond (Terminalia catappa) Leaf Extracts; D. R. Behera, Sunita Bhatnagar* and A.K.Mahapatra
- Medicinal and Aromatic Plants Division, Regional Plant Resource Centre, Nayapalli, Bhubaneswar-751015, India.
Antiparasitic, Antibacterial, and Antifungal Activities Derived from a Terminalia catappa Solution against Some Tilapia (Oreochromis niloticus) Pathogens; C. Chitmanat, K. Tongdonmuan, P. Khanom, P. Pachontis and W. Nunsong
- Department of Fisheries Technology College of Agricultural Production Maejo University, Chiang Mai, 50290 Thailand
Humic substances affect physiological condition and sex ratio of swordtail (Xiphophorus helleri Heckel) Thomas Meinelt, Kurt Schreckenbach, Klaus Knopf, Andreas Wienke, Angelika Stüber, Christian E. W. Steinberg
- Meinelt, T., Schreckenbach, K., Knopf, K. et al. Aquat. Sci. (2004) 66: 239. doi:10.1007/s00027-004-0706-9
The effect of some tannins on trout erythrocytes exposed to oxidative stress; Donatella Fedelia, Marco Berrettinia, Teresa Gabryelakb, Giancarlo Falcionia
Department of General Biophysics, University of Lodz, Banacha, 12/16, Lodz 90-237, Poland Received 15 July 2003, Revised 28 January 2004, Accepted 10 June 2004, Available online 23 August 2004
Antibacterial Properties of Tannic Acid and Related Compounds against the Fish Pathogen Cytophaga columnaris; Guojing Zhao , King-Thom Chung , Kimberly Milow , Wenxian Wang & S. Edward Stevens Jr.
- Published online: 09 Jan 2011 Department of Microbiology and Molecular Cell Sciences, University of Memphis
Growth Inhibition of Selected Aquatic Bacteria by Tannic Acid and Related Compounds: King-Thom Chung , Guojing Zhao , Edward Stevens Jr. , Bill A. Simco & C. I. Wei
- Published online: 09 Jan 2011 Department of Microbiology and Molecular Cell Sciences, University of Memphis
Antileishmanial activity and immune modulatory effects of tannins and related compounds on Leishmania parasitised RAW 264.7 cells; Herbert Kolodzieja, Albrecht F. Kiderlenb
- Robert Koch-Institut, Department of Infectious Diseases, Nordufer 20, D-13353 Berlin, Germany Revised 14 December 2004, Available online 12 February 2005
Antibacterial action of several tannins against Staphylococcus aureus; Hisanori Akiyama*, Kazuyasu Fujii, Osamu Yamasaki, Takashi Oono and Keiji Iwatsuki
- Department of Dermatology, Okayama University Graduate School of Medicine and Dentistry, Shikata-cho 2-5-1, Okayama 700-8558, Japan
Humic substances affect physiological condition and sex ratio of swordtail (Xiphophorus helleri Heckel) Meinelt, T., Schreckenbach, K., Knopf, K. et al. Aquat. Sci. (2004) 66: 239. doi:10.1007/s00027-004-0706-9
- Aquatic Sciences June 2004, Volume 66, Issue 2, pp 239–245
DISSOLVED HUMIC SUBSTANCES FACILITATE FISH LIFE IN EXTREME AQUATIC ENVIRONMENTS AND HAVE THE POTENTIAL TO EXTEND THE LIFESPAN OF CAENORHABDITIS ELEGANS. Steinberg, Christian E. W.; Saul, Nadine; Pietsch, Kerstin; Meinelt, Thomas; Rienau, Stefanie; Menzel, Ralph
- Annals of Environmental Science . Feb2007, p81-90. 10p.
Physiological effects of humic substances on higher plants: Serenella Nardia, , , Diego Pizzeghelloa, Adele Muscolob, Angelo Vianelloc Received 16 July 2001, Revised 15 July 2002, Accepted 19 August 2002, Available online 28 October 2002
- Dipartimento di Biologia ed Economia Agro-industriale, Sezione di Biologia Vegetale, Università di Udine, Via Cotonificio 108, 33100 Udine, Italy