Well I think the problem is you are missing the important bits of information people are giving you and going back to the same old thing time and again. In your mind the issues are with the size of the tank. Even though people @RD. @thebiggerthebetter and others are directly telling you the issues will be compatibility,maintenance, feeding and more. The 24h had little to do with what rd said. Reread everything as many times as it takes to get that into your head.
I for one believe as a person with ZERO fish keeping history you are making a huge mistake in getting a 300g tank. You dont even know if you like fish keeping. Youve never done it! Get a 75g find a couple fish you like that are a moderate size compatible with that size tank and try it out for a year or so. I'm not trying to beat you up buddy. But come on when is this line of thinking going to cease. This whole thread is absurd. Its like a dog chasing its tail.
Read the thread please! Stop comenting on half answers and other misinterpretations. Read it word for word and understand what it is they are telling you. I really hope you like keeping fish.
Every thread the OP has started has turned out to be absurd, and let's face it there are many. And the frustrating thing for me is that any good advice he is given, and god we've all chipped in and tried, seems to go right over his head.
We're no closer to getting through to him from the moment he starts a thread right up until the end of it, and then he'll start another thread which will go the same way.
The real eye opener for me is the fact that if this is what he is like now, BEFORE he's even got his tank and fish, what on earth is he going to be like when he's got said tank! We are seriously going to be inundated with thread after thread of problems, and there will be many.
Yes we can put him on ignore or just read all his stuff and refuse to engage, but by and large we're a good bunch of people who like helping. It's very frustrating.