Water Gardening: hey guys im back, 1 by LouC

LouC wrote:
Please don't laugh. I have a water feature rather than a pond. Just put this together in the last 10 days. Have 5 baby koi from wallyworld (I know, first mistake). One little guy keeps coming to the fountain and just staying with it beating him up. BTW the tank hold 360 gallons. Has a filter/fountain and a little waterfall with two water lillies and a star grass. The water is very clear. They are still more than a little shy.
Went to some other websites and they scared me to death that they may all have disease and/or parasite, etc.,etc,.etc. From following the water threads I already know you are the koi expert. Help. I'm totally out of my league but had to start somewhere.