to get rid of ammonia do 25% water changes, and dont feed your oscar so
much while your doing this. this is going to get rid of some of the
ammonia and by not feeding so much which will stop your oscar from going
poo so much. this will build your biological bacterial.

its okay that you dont have a test kit, but its best to get one as soon
as possible. one that test for ammonia, nitrIte, and nitrAte, and ph.
your amm and nit should always be at 0 and your nitrates shouldnt idealy
get larger than 20-30.

the blanket trick does work. becuase it strips the algae of the light it
needs. so you will prolly need to do this whenever the algae starts to
build up. and the main reason there's algae is from exces light or
phosphates.

sorry if ima just going and going, but just get the test kits and post
the results. and i forget if you told us what size tank and what kind of
filters you have on the tank. hope this helps



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