1. Hybrid "Parrot" and "Flowerhorn" cichlids have raised an outcry as "frankenfish," yet some older hybrids of species are widely accepted. Of several familiar aquarium fishes, the only one definitely *not* a hybrid is the "Sunset" Platy. the Green Tiger Barb. the Red Swordtail. the "Sunset" Gourami.

2. That white gravel you just bought will raise the alkalinity of your water. You tested it in a saucer by covering some with vinegar, and it produced bubbles of oxygen. carbon dioxide. nitrogen. hydrogen sulfide.

3. During a long summer heat wave, you lower the water level in your Corydoras tank an inch every few days, until the water is only three inches deep. The temperature climbs to 80 degrees. Then, when the heat breaks, you quickly top up the tank with cool (70 degree) distilled water. Sound like a good way to get them to spawn? Yes No

4. Dense populations of cichlid fishes and severe competition for territory in rocky areas of Lake Malawi have created evolutionary pressure in favor of egg-scattering. mass spawnings. herbivory. mouthbrooding.

5. Do you have fish eggs in the aquarium, or are they snail eggs? The eggs are on plant leaves. You're pretty sure they're snail eggs, because they're scattered singly or in pairs over the leaf. they're a clear golden color. you can see little black dots inside. they're bound together in a gelatinous mass.

6. Two general characteristics of species of fish that habitually school: they show minimal intraspecific aggression and little sexual dimorphism. True False

7. Whether you call it Nandopsis cyanoguttatum or Herichthys cyanoguttatum, the Texas Cichlid or Rio Grande Cichlid is the only cichlid native to the U.S. ...And it is also the northernmost cichlid on the planet. true. true. true. false. false. true. false. false.

8. If your aquarium is recreating a small stream in undisturbed Amazonian rainforest, it would be *least* likely to contain. lush Amazon Swordplants. a dense carpet of dead leaves. dark tea-colored water. tangles of twiggy brush.

9. Chloramines are increasingly replacing chlorine in our water supply. The traditional chemical in aquarium dechlorinators has been sodium thiosulfate. It neutralizes the chlorine in water, and it neutralizes the chlorine in chloramines too. True False

10. The "Weberian ossicles" are a series of small bones behind the head that aid certain groups of fishes in navigating in darkness. swallowing prey. keeping upright. perceiving sound.