Hi all can I keep gold fish about 10 cm wth guppies, and neons? it seems they don't have anything to do with each other but I lost the mother of my guppy fries this morning and I feel guilty because I put the gold fish in the main tank. and I liked it so much. by the way two day before I bought 3 male guppies but yesterday I found one of them dead, it was beautiful. but at first there was a small area in top of his head that didn't have any flakes, the guppy was about 3.5 cm. do you think is there any problem with the goldfish?