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thank you for playing and the feedback, im glad you had some fun with it. we'll try to address some of these issues in future versions. I have recorded them in our issues tracker.
In case you want to play again, i think you misunderstood a few things. fish are sorted by rarity level, and which rarity levels can appear in the shop is based on your tank size. so the bigger your tank the rarer the fish you might see. they are picked the same way even after a minigame ends.
also fish dont spawn coins only at the bottom, your fish were probably just there a lot. and you dont need to stack food to make your fish go upwards, they will swim upwards naturally, or if they're hungry and food is above them.
I'll still try to adjust those things to avoid confusion though