clownfish deaths 1 always lives what is wrong here

Ok so im new to the hobby first time on this forum posting. Been reading it for about a year before I got the tank (I do ALOT of research before I get into something like this) but let me get into my problem and its not a mantis shrimp I always find the bodies and take them out



Hi guys my aquariums is as follows (sorry if my spelling is wrong on anything)

75gallon set up for about 2 months now

about 80+/- lbs live rock

60lbs live sand

fluval 405 canister filter

seaclone 100g skimmer

temp 78-80 bad heater need a new one (temp fluctuation is not bad it just creeps up and down over a week or so never above or below those two though

48" odyssea t5ho lights 2 10k 2 actinic



Params

1.021 sg

0 amonia

0 nitrites

5-10 nitrates

15g water change every 2 weeks

fish list

1 snowflake occelaris 2" +/-

1 lawnmower blennie

1 neon dottyback

1 six-line wrasse

1 diamond watchman goby (sits at bottom eats sand all day) lfs said thats what it was but heard theres two different ones that look like that

1 neon goby



inverts

1 skunk cleaner shrimp

assortment of turbo astreous and 2 other kinds of snails

I think they are blue legged hermit crabs maybe 10 to 20 they come in as hitch hikers I bout maybe 5 and they either hitchhiked or made behbehs lol

and one 2" bubbletip anemone its been in there for about 3 weeks now originally got it for the clowns but then it moved to the very back of the tank where I didnt want it like they tend to do so I hear lol



anyways my problem is ive had the tank running for about 2 months now since may 26 2014

I started out with 2 clowns after the tank got done cycleing the first time no fish just a table shrimp in it for a week then out one clown died due to second cycle is what lfs told me I added 2 domino damsels and the neon dottyback 1 damsel died in first 24h second damsel died 1w later added lawnmower blennie and sixline wrasse 6 line jumped out and died 2 days after I got it cause I forgot to put lid back on added another one and the diamond watchman goby added another clown it lived about a week and was doing fine then died added another clown it died added another clown it died

went to one of my buddies hes been doing marine for about 12 yrs he told me that my clown might just be really aggressive and killing my other clowns so he told me hed give me store credit if I bought a pair of clowns from his tank so I did that I get them put them in my tank 4 days later one of them kicked the bucket now im back to having just one clown again and all other fish are still alive



But here is clown types all occelaris that have died

1 false percula

1 misbar false percula

1 extreme misbar false percula (almost a naked clown only had a tiny bit of a white spot on its gill maybe a 1/4" wasnt ick either lol

1 snowflake clown



im sorry this is so long but I really want a clownfish couple dont care if they breed just want a pair of them and a anemone for them I know clown/anemone hosting takes time but I think its cool to watch



also acclimation procedures ive tried have been

Float and drip then transfer fish only

float and drip then pour bucket into tank

float then transfer

Float then pour bag into tank



what im trying to figure out is why only one of my clowns dies even when I put them in as a pair and the other one doesnt is there anything I can do that im not doing to prevent this or am I doing this properly and its just the fish being weak and stressed to badly to the point of deathand sorry if this should be put somewhere else I couldnt find a clown only section so I figured itd go good here lol