fishes

Question
i just want to ask you, Ihave 25 gallon,it's finish cycle i have about 6 fises in there,  bloodfin tetra, and gourmi and 2 other tetra. i want ask you if gravel vacumm is necessary. My amonia level stays at 0. water is crystal clear. I have a aqua clear 50 filter with carbon in it.

Other thing i want to ask you what other good fishes ave in the tank? my temperature have been set to 24, is this a right temperature for trophical fishes?

other things is that i have heater inside, every week my water level comes down because heater keep removing, do i have do water change or add fresh water and fill it up?

sorry for a lot of question, thank you for your time

Answer
Yes you do need to vacuum the gravel occasionally. Even if the water quality is perfect, you should still perform partial water changes monthly. In doing this, if you vacuum the gravel as your means of removing the water for the change then you complete this task. Also, the temperature you have it set at is great. Water will always evaporate whether it is hot or cold. To solve the problem, just simply top it off as you had mentioned. If the level falls around the same time that a partial water change is due, then there ya go, improvise. Good luck. Feel free to contact me anytime with further questions.