the water on my tank got bubbly and oily.. i dont know why but i thinks its from the food i feed them regularly (SERA micron)... is it still safe? or i need a water change?

can you give me more tips/advice for my fry to grow fast and healthy.. thanks

i would do a water change as soon as you can.

im not an expert and am not sure what that food is but if it is frozen food i got told to rinse it with tank water before putting it inside the tank or this would happen.

hope this helps

well its a very fine powdered growth food... anyway ill go water change soon... how much water change will i do?

i would recomend doing the water tests first and if the quality is bad do a 50% but if its good or just "ok" then 25%

the best way to figure out when and how much water to change is to use the water test kit. after one week test your nitrates if the reading is above 40 do a 25-30% water change. retest again after about 5 days and if your nitrates are above 40 again either try a larger water change or do more water changes in the week