Brought home a Yellow Tailed Damsel yesterday and he seemed to be doing great.I put him in the tank to help with cycling and he played pick-a boo for awhile but he came out it full view after awhile.Now he is hanging out at the bottom of the tank near the heater behind the lr. The hydrometer reads 1.020 and the power head is blowing just a little air.Is this normal or am I just paranoid?Also, the power head is designed for tanks up to 30 gallons...trusted pet store; however, the power head did not come with instructions...It is a Topfin powerhead 30.I have under gravel filtration(I know not the best thing but hoping to get a 29 or 36 gallon tank with a canister filter in the next 32 months or sooner depending on the finances).Any advice would be appreciated!I really want this fish to live to be housed in a bigger tank!