just use parasite clear, in the past when i had to use it i dosed the tank like it said and then with the extra tablets i would break off a small piece and dissolve it in a cup of tank water that i then soaked the food in 10min prior to feeding (strain food out with net and pour medicated cup water down the sink not into the tank or will throw off the med concentrations) a week of this and all parasites should be gone GOOD LUCK, and i cant help you with the fungal/algae stuff maybe try getting some rubber lip plecos (i think thats what they are called) and see if they take care of it, they stay small so you don't have to worry about having a huge pleco in your tank, i know how you feel though i had this gross white fungus growing on my wood for the longest time that has finally went away after having the wood in there for frikin 8-9months