Parrot fish are a man made crossbreed. Not much is known about their breed specific ailments yet. Black Spot Disease, Ready to mate, water quality issue, changing color naturally as it matures, The black on your fish could be any one of these. Most of the time one or another of these will produce the markings and will not have an impact on the fishes behavior. You can attempt to medicate the tank if you want, if it is a disease parasite then Maracide would probably work best. It could also clear up on it's own. I would do a water change and test water quality first.

As long as the frog is able to reach the surface to breathe as needed with out having a way to escape it should be fine. A tall plant or other decoration placed in the back corner for perching would be beneficial.

No, they're two separate species.

Probably the easiest way to sex these fishes is by the shape of their foreheads. Males have a flatter, more leveled slope to their foreheads and are slightly wider. Females have a more rounded forehead and are slightly plumper when in spawning condition. acoording to an individual who responded on answers.yahoo.com

Activated Charcoal can be used in a filter to purify the water (It will filter fine stuff like most medications out too). It does however appear to have a major drawback in that once it is saturated and can hold no more, it has been know to release its toxic load and contaminate the tank. Care must be taken when using it and it MUST be replaced very regularly to avoid the posibility of the problem described occuring.

It is very hard to tell you exactly how much gravel you should use. For successfull water plant growing, more is always better than less. I always slope the gravel from as deep as 3 inches at the back of the tank, down to a bit over 1 inch at the front. This uses gravity, and results in much of the detrius, mulm and poo ending up at the front of the tank for easy removal by syphoning (cleaning)

No... the angel fish as babies will be fine with guppies, but as they get older and bigger, the will become more aggressive and will eat anything that it can get to.

Fish expel solid waste into the water, they do not pick a spot like many land animals.

could be because of bacteria changing genes or temperatures might affect them possibly camaflauge techniques theres many reasons

Not all salmon do die after spawning. Those that do have evolved over millions of years to do this in order to ensure the survival of the species.

Danios live for about 3-5 years. Try to get a group of danios that are the same size.

You cant cross breed fish that are different species unless theyre really really closely related, like swordtails and platies. To breed them just put a male and a female together and hope that they breed.

gross slimy but kinda cute

You don't "mate " guppies. They do it themselves. Simply place a mature female and a mature male together in a properly set up, heated, filtered tank (minimum size 5 gallon) and feed and look after them properly, and they will do whatever it takes to produce young.

Oscars are tough buggers and get pretty big the only thing that could kill a full grown Oscar is age or you. If you want to get rid of it which hopefully this is not why you asked the question just call a small chain or family owned pet store they will usually take it.

if your parakeet stand long hours below in your cage. you can`t put your parakeet in a winter place because they can`t make it to survive. i have a parakeet who died because at the rainy winter place.

If the tank is actually filled to the brim (tanks never are) the water would weigh 8.35lbs x 30gallons which is 250.5 lbs. To obtain an accurate total weight you would have to add in the weight of the sand/gravel substrate, and the rocks (decore) and the weight of the empty tank. Then you would subtract the weight of the top 1 inch or so that is always left empty.

I have been looking for an answer to this question for SOME time. I got mine about 7 years ago..they keep changing shapes/and how many I have...not I am noticiing that they are on my palms.

Been to more than 5 dermatologists. they cant figure it out. Everyone keeps tellin me I have syphllis. I do not. I have been tested EVERY time..and it is not syphillis. at first when it was just the bottom of my feet, I wasn't that upset..although it is very embarrasing!! Now my palms?

I am mortified. cuz people just assume that you are dirty.

--- Arsenic poisoning or pollution is pretty rare ... has that been considered? Or parasites, but the dermotologist should have spotted that.

well they keep breeding while there is a female in the tank and the water conditions are right. you should get at least 1 male and 3 or 4 females or 2 males and 3 or 4 females. you want to get more females than males so the males dont harrass the female. the female can often give birth 3 to 6 times without having to breed again. I remember when my male and this one female bred together and soon after her second birth the male died and she gave birth about 4 more times.then a few months her last birth she dissapeared. Anyway its about 2-3 weeks between births so if your platy is pregnant I hope this helps and good luck!!!!

Yes I'm fairly certain. I have 1cardinal and 4 neons and they all swim together...

Heater/thermostat units come in many sizes. I have found that pet shops charge far too much for them here in Australia so I always buy mine off the web. for example a 300 watt heater/thermostat at the local pet shop was $Aus98.00 +. On the web after searching a bit, the identical heater/thermostat cost me $Aus35.00.including postage. My advice is to google and look around and compare prices.

yes they can

No

Boil it first, then freeze it, then boil it again. You can test it in vinegar afterwards if you want. If there is any fizzing/bubbling, it's not safe for your fish. If it passes the vinegar test, soak them for a couple days in conditioned tap water and then add them to your aquarium.

yes