Anyone seen this fungus or glass groth?

My two 7" albino Oscars have been plagued with a couple of diseases in a perfectly clean 60 gallon tank. I managed to get the HITD under control early on with Fiz-tab parasite treatment, but the mild case of fin Rot has been persistent and I am now on the 2nd dose of Fiz-Tab Fungus treatment.

The photos below are 3 zoom in pictures of what I think is the Fungus growing on the glass end panel just below the stealth heater. It almost looks plant like, has anyone seen anything like this before and know what it is???

Wow thanks for the tip although Im still not sure if its Hydra is a problem for my fish, an intruder nonetheless wonder how to kill this jellyfish. The following info and illustration from the National Audubon Society:

"Hydras, fascinating animals related to marine corals, sea anemones and jellyfish, were attached to surfaces like leaf litter or the tank glass. The ones in our aquarium were no larger than one-half inch. We had two species, one that was white, and one that was green from the algae living within its cells. Tentacles at the top of the body reach out to capture prey. We watched as mosquito larvae and other tiny creatures became entangled in the hydra's tentacles and were consumed. One way hydras reproduce is by forming buds that branch into a new, smaller version of the adult animal. We had many branching hydra in our tank."

Did research and besides growing on objects to reach out and grab fry can also grow under fish scales and eat flesh. Live only in very clean tanks and are are very sensitive to polluted environments. Some aquarium hobbyist like them in their small critter tanks for controlling other bugs.

Natural remedies include salt, raised temp to 105F, PH drop to 5 or 6 or use of killy-fish to eat them. All seem extreme to me for my Oscar tank so I am going with the parasite chemical called Trichlorfon. The main ingredients in Jungle Fizz Tabs which I have used successfully in the past to cure my Koi of Flukes. Only this time I removed the carbon and cleaned the filter and installed a power-head for added aeration. Last time I used this Parasite treatment was a month ago and it rapidly cured my Oscars of "Hole in head" but its not unusual to have to re-dose (according to the instructions) if some different parasites persist like Hydra. As of now my normally crystal clear tank is completely opaque with this parasite medication, but my Oscars seem to be taking it all in stride. Will see once the water clears if the Hydra are killed.