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2. Substrate (aquarium) - Wikipedia

   en.wikipedia.org/wiki/Substrate_(aquarium)

   For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]

3. Ancistrus - Wikipedia

   en.wikipedia.org/wiki/Ancistrus

   In the wild, Ancistrus species prefer flowing water, so tanks with flow are typically used when keeping them in captivity. Since they are bottom-dwelling fish, substrate is considered preferable to a bare tank floor. Mixtures of gravel, dirt, and clay are frequently used as substrate for Ancistrus.

4. Self-cleaning surfaces - Wikipedia

   en.wikipedia.org/wiki/Self-cleaning_surfaces

   Self-cleaning surfaces are a class of materials with the inherent ability to remove any debris or bacteria from their surfaces in a variety of ways. The self-cleaning functionality of these surfaces are commonly inspired by natural phenomena observed in lotus leaves, gecko feet, and water striders to name a few.

5. Discus (fish) - Wikipedia

   en.wikipedia.org/wiki/Discus_(fish)

   Symphysodon (colloquially known as discus or discus fish) is a genus of cichlids native to the Amazon river basin in Brazil.Due to their distinctive shape, calm behavior, many bright colors and patterns, and dedicated parenting techniques, discus are popular as freshwater aquarium fish, and their aquaculture in several countries in Asia (notably Thailand) [1] is a major industry.

6. Supradiscus micropulvinus - Wikipedia

   en.wikipedia.org/wiki/Supradiscus_micropulvinus

   At the type locality in Xichou County, Supradiscus micropulvinus prefer stream stretches with a rapid current and stony substrate. The diet is mostly based on algae, but they also feed on other aquatic plants and on larvae of aquatic insects.

7. Today’s NYT ‘Strands’ Hints, Spangram and Answers for Friday ...

   www.aol.com/today-nyt-strands-hints-spangram...

   Where to shop today's best deals: Kate Spade, Amazon, Walmart and more. AOL. The best under-$50 clothing items to buy at Amazon right now. See all deals. In Other News. Finance. Finance.

8. List of brackish aquarium fish species - Wikipedia

   en.wikipedia.org/wiki/List_of_brackish_aquarium...

   Requires brackish aquarium conditions with very low Nitrite and Nitrate levels to be kept successfully. Freshwater compromises immune system, harms puffer, and shortens life extremely. Commonly kept in freshwater. Green spotted puffer Tetraodon nigroviridis: 6" Often sold as freshwater fish, but this species actually thrives in brackish water.

9. Which companies have the most employees on H-1B visas? - AOL

   www.aol.com/companies-most-employees-h-1b...

   In helping instigate a heated debate over H-1B visas, Elon Musk is speaking both from personal experience and as a business owner.That's because his company, electric car maker Tesla, is among the ...