I have some Historic Iris. I do not have that one, sorry. see my gallery below. Here is a link that might be useful: Iris Gallery

Fish are cold-blooded animals and I doubt they are necessarily drawn to a heat source. We tend to anthropomorphize - to attribute human characteristics - to our fish when that may be not the case. HereÂs an experiment you can do if you have two water heaters: place each heater in different parts of the pond and at the same depth. Wait a few hours then turn one on but donÂt disturb the other. After an hour or so check to see if the fish have migrated towards the "on" heater. At some point turn that heater off and then turn the other one on. Do they migrate to the other "on" heater? Are they rushing to the "on" heater with their fins extended? LOL! If not then theyÂre not being drawn towards a heat source. As far as I am aware fish do not manufacture vitamin D from sunlight - the amount of actual sun energy passing through even 6 inches of water is pretty minimal. An example, obviously not necessarily relevant to our ponds, would be what fish are doing at depths of 200-400 feet where sunlight essentially no longer exists. I suspect that most of the type of behavior you describe is predator-prey based. At moderate temperatures the fish will go were their food (fish are the "predator" and the food source is now the "prey") is most available - which probably is where it is warmest (the short period of on/off with the heaters should probably not change available food to any significant extent). Your pond probably has taken most of the day to warm up. Given the size of your tank you might see that the afternoon temperatures in the water on a very bright sunny day approaching the mid-fifties if the air temperature isnÂt too cold. However, when the water temperature is way down in the thirties the fish slow down. At this point most fish IÂve ever seen head for deeper water - to avoid predators such as herons, hawks, eagles  anything outside the pond environment since now the fish become the "prey". This behavior has probably been genetically encoded over the tens of thousands of years: you stay near the surface, youÂll get eaten! Dive and you survive. Just a few different thoughts on the subject. ÂDavid

I have the offer up in Ponds and Aquatic Plants. I wanted to get the offer out to AZ gardeners also. Thanks

I am lucky to have well water and have not needed to concern myself with chlorine, but I am under the impression that there are products that can be directly added to a pond when new water is added. I would assume that moving water would be useful or required. I'm sure someone else will help us out on this. You did say something about a waterfall. Is there a place for one? The water normally comes from a pump in or beside the pond that pulls water from the pond up to the waterfall via some usually hidden pipe. Flowing water is good for cleaning, aeration and bug control, but it is not required. OTOH it is not that difficult. There are plenty of inexpensive in pond pumps and tubing is far cheaper. Give us a little more detail or a picture.