Welcome to Aquaworld Aquarium
Aquaworld Aquarium is a free online aquarium and pond publication. Aquaworld Aquarium website is an online-only publication that distributes information about the science and art of aquariums and ponds.
![12 gallon lab tank with 30 mesh (grit) sand.](articles/article_img/30meshSubstrate/30meshSandWithProbes_741x417.jpg)
From the Aquarium Lab
30 Mesh (Grit) Substate
Evaluating ORP Values for an Anoxic Environment in 30 Mesh Sand Found in Hardware Stores
![Substrate sizes used in experiment.](articles/article_img/ORPofSubstrate/ORP_Test_SubstrateSize_741x417.jpg)
From the Aquarium Lab
Oxidation Reduction Potential of Substrate
Evaluating ORP Values of Substrate Size, Depth, and the Effect of Current
![Substrate sizes used in experiment.](articles/article_img/SubstrateDenitrification/Substrate_size_Comparison_1920x1080.jpg)
From the Aquarium Lab
Substrate Denitrification
Substrate Size Experiment
![Link to The Silent Killer Article](articles/article_img/GravelVacuum_741x417.jpg)
The Silent Killer
How to Use a Gravel Vacuum in the Modern Aquarium
![Hatching Brine Shrimp](articles/article_img/BrineShrimpHatchery/BrineShrimpHatchery_741x417.jpg)
Hatching Brine Shrimp
![Tony Griffitts' Beef Heart Aquarium Fish Food Recipe](articles/article_img/Beef_Heart/CobaltBlueXHeckelCross_741x417.jpg)
Tony Griffitts' Beef Heart Aquarium Fish Food Recipe
![The Adverse Effect of Nitrate on Fish](articles/article_img/Nitrate/HoleInTheHead_Parapetenia_managuensis_741x417.jpg)
The Adverse Effect of Nitrate on Fish
![Ammonia Toxicity and the pH Relationship](articles/article_img/AmmoniaToxicity/pH_and_AmmoniaTests_Opacity_741x417.jpg)
Ammonia Toxicity and the pH Relationship
![Water Changes
How Much and How Often](articles/article_img/WaterChange/WaterDrained_741x417.jpg)
Water Changes
How Much and How Often
![Anaerobic Bacteria in Freshwater Aquariums](articles/article_img/AnaerobicBacteria_741x417.jpg)
Anaerobic Bacteria in Freshwater Aquariums
The Often Incorrectly Vilified Beneficial Bacteria
![Do it Yourself (DIY) LED Aquarium Lighting System](articles/article_img/DIY_LED/DIY_LED_741x1080.jpg)
Do it Yourself (DIY) LED Aquarium Lighting System
Spotlights for Planted Aquariums
![Adding Salt to a Freshwater Aquarium](articles/article_img/Adding_Salt/50_W_Discus_741x417.jpg)
Adding Salt to a Freshwater Aquarium
When and When not to Add Salt
![Angelfish](articles/article_img/Angelfish/KoiAngelfishPair_741x417.jpg)
Spawning and Raising Angelfish
![California Tiger Endler's Livebearer](articles/article_img/CA_Tiger_Endler/CA_TigerEndler_741x417.jpg)
California Tiger Endler's Livebearer
A Beautiful New Livebearer!
![Endler's Livebearer Poecilia wingei](articles/article_img/EndlersLivebearer/EndlersInHatchery_Male_741x417.jpg)
Endler's Livebearer
The Original Article that Introduced the Fish to the Hobby
![Potting Soil](articles/article_img/PottingSoil/PottingSoilTank_741x417.jpg)
Potting Soil
Potting Soil Aquatic Plant Growing Technique
![60 Gallon Cube
Planted Aquarium](articles/article_img/60G_Cube/60_Cube_741x417.jpg)
60 Gallon Cube Planted Aquarium
![Cichlids in the Planted Aquarium](articles/article_img/CichlidPlantedAquarium/1995_Tonys90G_Corner_741x417.jpg)
Cichlids in the Planted Aquarium
![Crossing A Wild Heckel with a Cobalt Blue Discus](articles/article_img/CrossingCobaltBlueHeckel/CobaltXHeckelSpawning_741x417.jpg)
Crossing A Wild Heckel with a Cobalt Blue Discus
![Discus](articles/article_img/Discus/125_Discus_741x234.jpg)
Discus
King Of The Aquarium
![Discus Plague](articles/article_img/DiscusPlague/DiscusPlague_741x417.jpg)
Discus Plague
![Endler's Livebearer
It's a Guppy!](articles/article_img/EndlersLivebearerItsaGuppy/EndlersLivebearer_741x417.jpg)
Endler's Livebearer
It's a Guppy!
Poecilia wingei reticulata
![Lake Tanganyika Tank at Aquaworld Aquarium](articles/article_img/LakeTanganyika/LakeTanganyikaTank_741x417.jpg)
Lake Tanganyika Tank at Aquaworld Aquarium
![Link to The Silent Killer Article](articles/article_img/PalawanNegros/Heteractis_crispa_Purple_1920x1080.jpg)
Taytay Bay and South Negros Philippines
A Photo Essay
![Protein Skimmers](articles/article_img/Protein_Skimmers/ProteinSkimmer_741x417.jpg)
Protein Skimmers
Do You Really Need One?
![How to Quarantine Marine Fish](articles/article_img/QuarantineMarineFish/Frogfish_741x417.jpg)
How to Quarantine Marine Fish
![Treating Marine Fish
for Bacterial Diseases](articles/article_img/MarineFishBacterialDiseases/RaccoonBefore_1400x788.jpg)
Treating Marine Fish for Bacterial Diseases
![Lymphocystis Virus](articles/article_img/LymphocystisVirus/Lymphocystis_Emperor_Angel_741x417.jpg)
Lymphocystis Virus
![Marine Fish Head and Lateral Line Erosion](articles/article_img/HLLE/HLLE_741x417.jpg)
Marine Fish Head and Lateral Line Erosion
Cause, Cure, and Prevention
![The Denitrator](articles/article_img/Denitrator/Denitrator_Graphic_741x369.jpg)