hi everybody!
i just came on here to see what you guys have to say about how well I am doing
recently i got my first proper fish tank. until then i had only bred guppies for a while which, after a stunning bout of english summer, froze to death (about 3 tanks with 20 odd guppies each) ive always wanted a tropical tank but realized it was an incredibly hard thing to acheive(wanting clownfish) so i got a begginer freshwater set with an elite mini filter. until now i never used to 'cycle' the water or anything. so a couple of days ago i bought two comet goldfish for my 10 litre tank (which i think is 2+ gallons?) to start simple and already ive encountered problems.
1. my fish won't eat much, im not overfeeding them i collect what they don't eat
2. the dealer gave me two variations of comet, one big silver on with a single orange spot on his head and a smaller one with several orange spots. the small one has what looks like singed fray on its dorsal fin and keeps following and rubbing against the bigger one, who keeps nipping it. theres only 1 cm difference but they don't seem to cope together. also the smaller one is swimming quite rapidly in the same spot
3. is cloudy water from gravel a problem to the fishes health, im repalcing a tenth of the water every two days for a while is this allright?
4. ive halved the tank into an open space and an enclosed space consisting of 4 plants and a cove
5. one fish consistently gasps for air, ive opened the lid
6. the elite mini filter seems pretty crude to me, i heard the elite stingray 5 filter was pretty good will that fit a 10 litre tank?
7. are you supposed to put nurafin cycle in the filter sponge or the water?
8. do comets need a light, because ive got an office lamp on standby
9. does the filter have to be on ALL the time, its a noisy box of cheap cut-backs that is killing my electricity bill so i only keep it on at daytime, is this fine?
10. lastly is it possible to add some other animals, somthing like shrimp would be cool, or something that would clean the gravel although i don't want to overcrowd the tank
please help with any or all of the above and advise me on what i should improve on etc any help would be grateful

i just came on here to see what you guys have to say about how well I am doing
recently i got my first proper fish tank. until then i had only bred guppies for a while which, after a stunning bout of english summer, froze to death (about 3 tanks with 20 odd guppies each) ive always wanted a tropical tank but realized it was an incredibly hard thing to acheive(wanting clownfish) so i got a begginer freshwater set with an elite mini filter. until now i never used to 'cycle' the water or anything. so a couple of days ago i bought two comet goldfish for my 10 litre tank (which i think is 2+ gallons?) to start simple and already ive encountered problems.
1. my fish won't eat much, im not overfeeding them i collect what they don't eat
2. the dealer gave me two variations of comet, one big silver on with a single orange spot on his head and a smaller one with several orange spots. the small one has what looks like singed fray on its dorsal fin and keeps following and rubbing against the bigger one, who keeps nipping it. theres only 1 cm difference but they don't seem to cope together. also the smaller one is swimming quite rapidly in the same spot
3. is cloudy water from gravel a problem to the fishes health, im repalcing a tenth of the water every two days for a while is this allright?
4. ive halved the tank into an open space and an enclosed space consisting of 4 plants and a cove
5. one fish consistently gasps for air, ive opened the lid
6. the elite mini filter seems pretty crude to me, i heard the elite stingray 5 filter was pretty good will that fit a 10 litre tank?
7. are you supposed to put nurafin cycle in the filter sponge or the water?
8. do comets need a light, because ive got an office lamp on standby
9. does the filter have to be on ALL the time, its a noisy box of cheap cut-backs that is killing my electricity bill so i only keep it on at daytime, is this fine?
10. lastly is it possible to add some other animals, somthing like shrimp would be cool, or something that would clean the gravel although i don't want to overcrowd the tank
please help with any or all of the above and advise me on what i should improve on etc any help would be grateful