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Actually V didn't go far enough. Chihuahuas and St. Bernards are varieties of the same species. Goldfish/gibbel carp are one species within the carp group (Family Cyprinidae, Subfamily Cyprininae), koi/common carp are another. These fish have very different sizes in nature. Common carp are...

Heh. Yeah, ranid frogs are what ecologists call "r-strategists"; that is, they produce enormous numbers of offspring in the hopes that a few of them will make it by sheer luck. Tadpole mortality in the wild is extremely high; they are almost entirely defenseless and every predator that enters...

Yeah, they're lots of fun! Unfortunately there are a few really nasty amphibian diseases going around these days; the main ones are ranavirus and chytrid fungus. They have wiped out whole populations and even a few species in the tropics; they have been less catastrophic in the US but are...

First frog is a Gulf Coast Toad, Bufo (Ollotis) nebulifer; it is not the mother of your tadpoles. Tadpoles are a leopard frog, probably Southern Leopard Frog, Rana (Lithobates) sphenocephala. The tadpoles will eat algae, algae wafers, flake fish food, boiled greens, etc. The metamorphs will...

Sunfish in general are aggressive with one another, especially males, especially when there are females present. Think of them like CA/SA cichlids and you'll be on the right track. They certainly can be kept together, but you have to be careful that each fish has his own space and will not be...

20 long plus powerhead = darter tank. C'mon, man! Those are some gorgeous fish in those links, Inka. Man, I need to set up an Aussie or New Guinea biotope.

They don't school. I think one of each of the three species would allow for minimal aggression and not require you to sex fish. Alternatively, you get several fish of one or more species if all were one sex. Or you could get a trio (1 male, 2 female) of any or all species. There's plenty of...

This of of course assumes there is a customer base out there who knows ordinary goldfish are not suitable for a 20 gallon.. :D

Not the same species...the ancestor of goldfish is the gibbel carp, not the common carp. A much smaller fish, but still pretty hefty.

Does it need to be gobies specifically? If you are interested in goby-like fishes, there are eleotrids like the fat sleepers (Dormitator species), Ecuadoran water cow (Eleotris picta) and the numerous Australian gudgeons; these are engaging fish and many of the gudgeons are quite pretty. I...

You can position a small powerhead to create current along the bottom; this will keep detritus in the water column, so it will eventually end up in the filters.

Here's an idea- check Craigslist, Freecycle, yard sales, etc. for a cheap 75 gallon (or other tank with same footprint), maybe one with a cracked bottom. Remove the bottom glass and stack it on your existing tank. Then just put a glass canopy on one side and a secure screen top on the other...

Different Enneacanthus are compatible, so long as they all have plenty of hiding places. I think a 90 would do well with perhaps one of each Enneacanthus and schools of 6-10 each of golden topminnows (Fundulus chrysotus), redfaced topminnows (F. rubrifrons), and bluefin killifish (Lucania...

Yep, definitely a damsel. Get him out of there!

The Enneacanthus sunfish (bluespotted, banded, blackbanded) are great little fish, and you can keep them with most minnows, killifish, etc. They are generally not compatible with larger sunfish (Lepomis sp.), at least not the ones you mentioned. Certain moderate-sized, small-mouthed Lepomis...

That's going to be cramped- all those fish can reach 12"+ and are territorial. I would pare it down to a total of 5-6 sunfish at maximum. All males would be best if you can manage it. You could also throw in one or two bullheads if you want a catfish; spotted bullies (Ameiurus serracanthus)...

Congrats and good luck! You are referring to the clawed frogs in your signature, right?

Right, I meant the second part for the OP, not for you. Sorry for any confusion.

Do you have a deep freeze? You'll need plenty of room for all those frozen rats you'll be getting. Awesome pickup, by the way.

Yes, but no one is claiming that different goldfish varieties constitute different species. By the way, "hybrid" is usually reserved for crosses between two different species, while interspecific crosses are just called "crosses", "crossbreeds", or "intergrades" (the last for natural crosses...