Barb and everyone here has been doing a good job of helping you. I am very very sorry that your black moor did not make it.
Unfortunately nearly every one of us lost fish (I have lost a LOT of them) from things that we simply did not know. That is why Koko's is a good place - the knowledge of hundreds and hundreds of people is all put together here - and hopefully we can help you miss some of the pitfalls that have caught us in the past.
As important as conquering the ich is, getting the water under control is really the name of the game. Ich is an opportunistic parasite that takes over when the water is less than good. You can go a long way toward getting rid of those nasties simply by getting the water parameters under control.
I do not know how many days you have treated with RidIch - but perhaps you are on your 3rd day, so I am going to make a suggestion.....
Ich is an insidious little parasite - one that will encyst and hide in the gravel and other places, impervious to medications or salt. There it will wait until the fish are stressed by any problem, popping out to attack when their defenses are down. But, since salt, as noted here above, will kill and control the ich, yet is very benign, cheap and easy to dose, it may be the treatment of choice when you are dealing with an uncycled tank.
If you can handle it, I would suggest that you do a 100% water change every day for a bit here. Get a clean bucket or bowl. Scoop out enough water to fill it and place your fish in the bowl. Do not be afraid to scoop the fish up with your hand - ich does not transfer to humans. You can also use the scoop that you use to get the water and gently scoop the fish into that. These are better methods than a net - which may catch scales and injure the fish.
SEt the bowl aside for a bit. Empty out all the water from the tank. Refill your tank with water, treating it as you have done before - dechlorinator and checking the temperature. Since the average 10 gallon tank holds 9 gallons when filled to within a 1/2 inch of the top rim, calculate your salt this way - 3 level teaspoons of aquarium salt (the LARGE grained type that is sold in the fish dept.) for every gallon will get your tank to the .3% salt you want - so that is 27 teaspoons of salt. You can put this in a jar or container and shake and stir it up to dissolve it faster. Add this salt to the tank - but do not pour it in through the filter. Pour it to the side so it can dissapate in the water before being sucked into the filter...
(Edit: I hope I do not confuse the issue - but for your weaker fish - actually for most fish, it is better if you sneak up on the salt dose. Add 9 teaspoons of dissolved salt per the 9 gallons of water the first time. The next 100% water change you would add 18 tesaspoons in the 9 gallons. Finally, the next 100% water change would have the 27 teaspoons of salt. Keep in mind that if you change LESS than all 9 gallons you need to measure how much water you take out and only add the salt for that amount back. For example, once the tank is at .3% salt, and you changed out 5 gallons, you would add back 5 gallons of water with 15 teaspoons of salt in it - bringing your replacement water to the .3% salinity. )Set your aeration going. Start up the filter. Place the fish back in the tank.
That fish will produce plenty of waste/ammonia each day to feed the beneficial bacteria that make up a nitrogen cycled tank work, so you do not need to be afraid to change out all the water for a bit. Getting the toxic ammonia and the ich under control are paramount here, right now.
When you change the water, you can take the filter cartridge out of the filter and bang it or rub it clean in the USED fish water. Do not run tap water over it. It will start to grow the beneficial bacteria even as you change all the water.
Even after the ich spots disappear, it would be a good thing to continue with the .3% salt for at least 3 weeks..... As the ich goes, you will find that it is less and less important to do a 100% change of water - and you may be able to do only 80% or 75% and still keep the ammonia down to .50 or less. When the nitrites kick in, the same thing applies - change out what you need to, to keep the toxins down below .50ppm. The salt will help protect the fish from nitrite poisoning, too.
Do not be afraid of water changes. They are GOOD things.
There are several methods you can use to help that biological cycle get going faster - the best one being the use of a "seed". This is a small amount of the beneficial bacteria that is added to your tank to help grow the colony. While you are changing large amounts of water on a daily basis to help conquer the ich, though, something like BioSpira - a bacterial additive to seed the water - is not a good choice. It is in the water - you change the water and you toss it down the drain.
So hang in there for a bit with the salt and water changes and such.
Try frozen green peas (it wil only take 2-3) - cooked a bit, and popped out of their shells. Chop one a bit so it is small enough for your fist to eat. Sometimes you can hand feed the little guy - holding the food in front of his mouth. I have, at times pressed peas through a screen sieve, and, with a bit of the water they were heated in, sucked the pea slush up in a tiny plastic syringe and squirted it in the fish's mouth to feed them.
Please let us know how it is going. We are all here for you.