Originally Posted by TexasTanker
Last night during the water change I was inspecting the water for fry. What I found totally grossed me out. Little worms that resemble inch worms in their movement. It was almost teardrop shaped when stretched. White to sand in color and about an inch long. I also noticed these teeny tiny little bugs that I can't describe but to say they look like dots on crack. The single snail I first saw is now dozens of tiny snails of the Malaysian trumpet variety. My fish seem fine but in my googling of the worms last night I found an article that says detritus worms (which could resemble my worms... or most any worm) can kill KH and lower PH rapidly during a wormy population explosion. I happen to have that problem. My KH is non existent and it's a battle to keep my PH above 6.5.
All manner of planaria and or copepods can be found in aquariums where they often pose little threat and many are eaten by fishes. Large infestations are usually associated with perhaps more than minimal organic waste that is allowed to build up or from possible over feeding.
Often reducing the amount of food available by either reduced feedings and or gravel vaccuming will result in fewer numbers. I seem to recall that you used approx 30 lbs of mature gravel for the tank?
Could be that they hitch hiked in with the mature substrate or on recently added plants. If you are feeding sparingly, both the snail population and the worms,bugs,etc should thin out due to lack of food available.
I would in this case consider gravel vaccuming one third of the tank once each week and a different one third each time. in this way you can reduce numbers of the offending worms,bugs,and perhaps snails without disturbing too much of the nitrifying bacteria that gathers on substrtae as well as in the filter.
To keep pH above 6.5 i would consider the dolomite or crushed coral in mesh bag placed in filter compartment as mentioned earlier.