Hey everyone. I posted awhile ago about 3 goldfish in a 5 gallon tank (newb mistake!). I recently got my hands on a used 30 gallon tank. I want to move the goldfish into the 30 gallon and maybe see if I can keep a Betta and smaller tankmates with it in the 5 gallon. I've been reading up and, so far, it seems like I can put minnows, loaches and guppies in with the goldfish (corrections on this are extremely welcome). But before I even fill this tank up, I have a few questions (I'd like to reduce the amount of stupid mistakes I do from hundreds to maybe a few only haha
1) My 5 gallon tank is cycled. Adding some of the gravel from that tank into the 30 gallon should help it cycle even faster, correct?
2) I was given an unknown filter. Here's a picture of it:
The closest I can find to a name is one called a Skilter 250, but I know nothing about it. Is it even usable in its current condition? Something in the middle is missing according to some pictures I see.
3) I was also given a large rock. Here's a picture of it:
It has a weird texture and has a bunch of thin, little lines in the small mounds. Is there anything that is interesting about it?
4) Are there any plants that anyone can recommend for the tank? I know nothing about plants so far, but I'd really like to try my hand at ditching plastic plants.
Any responses are extremely welcome and appreciated!