Ok, alittle background, this is a "fish" story
when i was in jr. highschool and highschool i had a couple fish tanks and i enjoyed them but i guess i had other hobbies that pushed them out of the way, 10-15 years later i decided to get a fish tank, well my brother has always had tanks and he decided to help me out alittle. I wanted fresh water fish, and my brother was switching over to salt water, Troyboy on the forum already gave my brother a 265 gallon salt water tank but his house cannot support the weight of the tank right now (we are working on that) so i bought my brother a 110 gallon salt water tank and he gave me his 125 gallon fresh water tank, he also gave me the pumps and heaters that i would need and natural rock.
So i setup this tank and put everything in it and let it sit with nothing but the plants in it for about 3 days, then i put a pleco and a pictus catfish in the tank
after about 24 hours i noticed i couldnt find the pleco anymore, my brother told me to check all around the tank, low and behold i found it dried out behind the tank, it jumped out and died, i have a complete glass hood on the tank and there is only enough room for the pumps to fit in, so about 2" of the back of the tank is exposed. The pleco died, luckily petsmart has a 14 day return policy so i returned the dried corpse to the petstore they gave me store credit for the pleco so i got TWO highfinned pleco's and two more pictus catfish.
i let those fish have fun in the tank for 3-4 days then i decided i wanted to put some more fish in the tank, i went to the local pet store and got 3 firemouth cichlids, two jack dempsy's two black convicts and two sevani cichlids and one Medium sized tiger pleco about 7" long.
fast forward about 6 days, i notice the catfish have white spots starting to form on them, turns out its ICH which is a disease that fish get, i got medicine for them and started doing water changes on the tank, about 25% every 3 days, well after 2 days the sevani cichlids started showing a couple white spots, so my brother comes up and tells me to turn the heat on the tank up, i turned it up to about 83* this seemed to help the sevani cichlids, but one by one the pictus catfish died, about 24 hours apart each, so now thats 4 fish that have died in my tank so far and this was about a week ago, well today i couldnt find my 7" long pleco at first i just figured he was in one of the rock caves or possibly my large piece of driftwood, well i couldnt find him all day and he's normally a fairly active fish, tonight i found him behind the tank dried out..... so in less than 3 weeks ive lost 5 fish in my tank and my sevani cichlids still show some minor signs of ICH that im treating...
to make matters worse i setup a 29 gallon tank in my living room about a week ago, it has live plants and clay type gravel so the plants have some form of soil to grow in, i figured my other fish would need live food every once in a while so i put 2 dozen guppys in the tank and two fancy guppys, i also figured that after a couple months they would have many babys and i could just breed the food supply

well it turns out the feeder guppys that i got had a fungus called tail rot, about 2/3s or more of them have died in the last 3 days, luckily the fancy guppy and some of the normal guppys had babys so i have about 3 dozen babys in the tank, but the loss of about 20 or so guppys and 5 other fish that cost a bit more than mere feeder guppys.
i must be doing something wrong, i guess i should just be happy that i have some baby guppys and the rest of my cichlids are doing fine. i have meds in the large tank for the ich which all those fish seem healthy and active, and i have meds in the other tank for tail/fin rot.
i sure hope it gets easier over time.......
ill try to post some pictures of my tanks later.
matthew