I have 21 gallon saltwater tank and my cycle is done and i got 2 ocellaris baby clownfish but they are so so small :/ can i get 2 big clowngish like a little big they are not filling my aquarium :/ and i have a strong powerhead they will get caught in it? they are staying under it anyway helpful replies and i will be so thankful and if i can't get more clownfish what type of fish i can get with them?